No More Learning

However, so nice a fellow is Eratosthenes, that though he professes
himself a mathematician,[345] he rejects entirely the dictum of
Archimedes, who, in his work “On Bodies in Suspension,” says that all
liquids when left at rest assume a spherical form, having a centre of
gravity similar to that of the earth. A dictum which is acknowledged by
all who have the slightest pretensions to mathematical sagacity. He says
that the Mediterranean, which, according to his own description, is one
entire sea has not the same level even at points quite close to each
other; and offers us the authority of engineers for this piece of folly,
notwithstanding the affirmation of mathematicians that engineering is
itself only one division of the mathematics. He tells us that
Demetrius[346] intended to cut through the Isthmus of Corinth, to open a
passage for his fleet, but was prevented by his engineers, who, having
taken measurements, reported that the level of the sea at the Gulf of
Corinth was higher than at Cenchrea,[347] so that if he cut through the
isthmus, not only the coasts near Ægina, but even Ægina itself, with the
neighbouring islands, would be laid completely under water, while the
passage would prove of little value. According to Eratosthenes, it is
this which occasions the current in straits, especially the current in
the Strait of Sicily,[348] where effects similar to the flow and ebb of
the tide are remarked. The current there changes twice in the course of
a day and night, like as in that period the tides of the sea flow and
ebb twice. In the Tyrrhenian sea[349] the current which is called
descendent, and which runs towards the sea of Sicily, as if it followed
an inclined plane, corresponds to the flow of the tide in the ocean. We
may remark, that this current corresponds to the flow both in the time
of its commencement and cessation. For it commences at the rising and
setting of the moon, and recedes when that satellite attains its
meridian, whether above [in the zenith] or below the earth [in the
nadir]. In the same way occurs the opposite or ascending current, as it
is called. It corresponds to the ebb of the ocean, and commences as
soon as the moon has reached either zenith or nadir, and ceases the
moment she reaches the point of her rising or setting. [So far
Eratosthenes. ]

12. The nature of the ebb and flow has been sufficiently treated of by
Posidonius and Athenodorus. Concerning the flux and reflux of the
currents, which also may be explained by physics, it will suffice our
present purpose to observe, that in the various straits these do not
resemble each other, but each strait has its own peculiar current. Were
they to resemble each other, the current at the Strait of Sicily[350]
would not change merely twice during the day, (as Eratosthenes himself
tells us it does,) and at Chalcis seven times;[351] nor again that of
Constantinople, which does not change at all, but runs always in one
direction from the Euxine to the Propontis, and, as Hipparchus tells us,
sometimes ceases altogether. However, if they did all depend on one
cause, it would not be that which Eratosthenes has assigned, namely,
that the various seas have different levels. The kind of inequality he
supposes would not even be found in rivers only for the cataracts; and
where these cataracts occur, they occasion no ebbing, but have one
continued downward flow, which is caused by the inclination both of the
flow and the surface; and therefore though they have no flux or reflux
they do not remain still, on account of a principle of flowing which is
inherent in them; at the same time they cannot be on the same level, but
one must be higher and one lower than another. But who ever imagined the
surface of the ocean to be on a slope, especially those who follow a
system which supposes the four bodies we call elementary, to be
spherical. [352] For water is not like the earth, which being of a solid
nature is capable of permanent depressions and risings, but by its force
of gravity spreads equally over the earth, and assumes that kind of
level which Archimedes has assigned it.

13. To what we cited before concerning the temple of Ammon and Egypt,
Eratosthenes adds, that to judge from appearances, Mount Casius[353] was
formerly covered by sea, and the whole district now known as Gerra lay
under shoal water touching the bay of the Erythræan Sea,[354] but was
left dry on the union[355] of the [Mediterranean] Sea [with the ocean].
A certain amphibology lurks here under this description of the district
lying under shoal water and touching the bay of the Erythræan Sea; for
to touch[356] both means to be close to, and also to be in actual
contact with, so that when applied to water it would signify that one
flows into the other. I understand him to mean, that so long as the
strait by the Pillars of Hercules remained closed, these marshes covered
with shoal-water extended as far as the Arabian Gulf, but on that
passage being forced open, the Mediterranean, discharging itself by the
strait, became lower, and the land was left dry.

On the other hand, Hipparchus understands by the term _touching_, that
the Mediterranean, being over-full, flowed into the Erythræan Sea, and
he inquires how it could happen, that as the Mediterranean flowed out by
this new vent at the Pillars of Hercules, the Erythræan Sea, which was
all one with it, did not flow away too, and thus become lower, but has
always retained the same level? and since Eratosthenes supposes the
whole exterior sea to be confluent, it follows that the Western
Ocean[357] and the Erythræan Sea are all one; and thus [remarks
Hipparchus] as a necessary consequence, the sea beyond the Pillars of
Hercules, the Erythræan Sea, and that also which is confluent with
it,[358] have all the same level.

14. But, Eratosthenes would reply, I never said that, in consequence of
the repletion of the Mediterranean, it actually flowed into the
Erythræan Sea, but only that it approached very near thereto: besides,
it does not follow, that in one and the self-same sea, the level of its
surface must be all the same; to instance the Mediterranean itself, no
one, surely, will say it is of the same height at Lechæum[359] and at
Cenchrea. [360] This answer Hipparchus anticipated in his Critique; and
being aware of the opinion of Eratosthenes, was justified in attacking
his arguments. But he ought not to have taken it for granted, that when
Eratosthenes said the exterior sea was all one, he necessarily implied
that its level was every where the same.

15. Hipparchus rejects as false the [account] of the inscription on the
dolphins “by the delegates from Cyrene,” but the reason he assigns for
this is insufficient, viz. that though Cyrene was built in times of
which we have record, no one mentions the oracle,[361] as being situated
on the sea-shore. But what matters is that no historian has recorded
this, when amongst the other proofs from which we infer that this place
was formerly on the sea-shore, we number this of the dolphins which were
set up, and the inscription, “by the delegates from Cyrene? ”[362]
Hipparchus agrees that if the bottom of the sea were raised up, it would
lift the water with it, and might therefore overflow the land as far as
the locality of the oracle, or more than 3000 stadia from the shore; but
he will not allow that the rising would be sufficient to overflow the
Island of Pharos and the major portion of Egypt, since [he says] the
elevation would not be sufficient to submerge these. He alleges that if
before the opening of the passage at the Pillars of Hercules, the
Mediterranean had been swollen to such an extent as Eratosthenes
affirms, the whole of Libya, and the greater part of Europe and Asia,
must long ago have been buried beneath its waves. Besides, he adds, in
this case the Euxine would in certain places have been connected with
the Adriatic, since in the vicinity of the Euxine, [near to its
source,][363] the Ister is divided in its course, and flows into either
sea, owing to the peculiarities of the ground. [364] To this we object,
that the Ister does not take its rise at all in the vicinity of the
Euxine, but, on the contrary, beyond the mountains of the Adriatic;
neither does it flow into both the seas, but into the Euxine alone, and
only becomes divided just above its mouths. This latter, however, was an
error into which he fell in common with many of his predecessors. They
supposed that there was another river in addition to the former Ister,
bearing the same name, which emptied itself into the Adriatic, and from
which the country of Istria, through which it flowed, gained that
appellation. It was by this river they believed Jason returned on his
voyage from Colchis.

16. In order to lessen surprise at such changes as we have mentioned as
causes of the inundations and other similar phenomena which are supposed
to have produced Sicily, the islands of Æolus,[365] and the Pithecussæ,
it may be as well to compare with these others of a similar nature,
which either now are, or else have been observed in other localities. A
large array of such facts placed at once before the eye would serve to
allay our astonishment; while that which is uncommon startles our
perception, and manifests our general ignorance of the occurrences which
take place in nature and physical existence. For instance, supposing any
one should narrate the circumstances concerning Thera and the Therasian
Islands, situated in the strait between Crete and the Cyrenaic,[366]
Thera being itself the metropolis of Cyrene; or those [in connexion
with] Egypt, and many parts of Greece. For midway between Thera and
Therasia flames rushed forth from the sea for the space of four days;
causing the whole of it to boil and be all on fire; and after a little
an island twelve stadia in circumference, composed of the burning mass,
was thrown up, as if raised by machinery. After the cessation of this
phenomenon, the Rhodians, then masters of the sea, were the first who
dared to sail to the place, and they built there on the island a temple
to the Asphalian[367] Neptune. Posidonius remarks, that during an
earthquake which occurred in Phœnicia, a city situated above Sidon was
swallowed up, and that nearly two-thirds of Sidon also fell, but not
suddenly, and therefore with no great loss of life. That the same
occurred, though in a lighter form, throughout nearly the whole of
Syria, and was felt even in some of the Cyclades and the Island of
Eubœa,[368] so that the fountains of Arethusa, a spring in Chalcis, were
completely obstructed, and after some time forced for themselves another
opening, and the whole island ceased not to experience shocks until a
chasm was rent open in the earth in the plain of Lelanto,[369] from
which poured a river of burning mud.

17. Many writers have recorded similar occurrences, but it will suffice
us to narrate those which have been collected by Demetrius of Skepsis.

Apropos of that passage of Homer:—

“And now they reach’d the running rivulets clear,
Where from Scamander’s dizzy flood arise
Two fountains, tepid one, from which a smoke
Issues voluminous as from a fire,
The other, even in summer heats, like hail
For cold, or snow, or crystal stream frost-bound:”[370]

this writer tells us we must not be surprised, that although the cold
spring still remains, the hot cannot be discovered; and says we must
reckon the failing of the hot spring as the cause. He goes on to relate
certain catastrophes recorded by Democles, how formerly in the reign of
Tantalus[371] there were great earthquakes in Lydia and Ionia as far as
the Troad,[372] which swallowed up whole villages and overturned Mount
Sipylus;[373] marshes then became lakes, and the city of Troy was
covered by the waters. [374] Pharos, near Egypt, which anciently was an
island, may now be called a peninsula, and the same may be said of Tyre
and Clazomenæ. [375]

During my stay at Alexandria in Egypt the sea rose so high near
Pelusium[376] and Mount Casius[377] as to overflow the land, and convert
the mountain into an island, so that a journey from Casius into Phœnicia
might have been undertaken by water. We should not be surprised
therefore if in time to come the isthmus[378] which separates the
Egyptian sea[379] from the Erythræan,[380] should part asunder or
subside, and becoming a strait, connect the outer and inner seas,[381]
similarly to what has taken place at the strait of the Pillars.

At the commencement of this work will be found some other narrations of
a similar kind, which should be considered at the same time, and which
will greatly tend to strengthen our belief both in these works of nature
and also in its other changes.

18. The Piræus having been formerly an island, and lying πέραν, or off
the shore, is said to have thus received its name. Leucas,[382] on the
contrary, has been made an island by the Corinthians, who cut through
the isthmus which connected it with the shore [of the mainland]. It is
concerning this place that Laertes is made to say,

“Oh that I possess’d
Such vigour now as when in arms I took
Nericus, continental city fair. ”[383]

Here man devoted his labour to make a separation, in other instances to
the construction of moles and bridges. Such is that which connects the
island opposite to Syracuse[384] with the mainland. This junction is now
effected by means of a bridge, but formerly, according to Ibycus, by a
pier of picked stones, which he calls _elect_. Of Bura[385] and
Helice,[386] one has been swallowed by an earthquake, the other covered
by the waves. Near to Methone,[387] which is on the Hermionic Gulf,[388]
a mountain seven stadia in height was cast up during a fiery eruption;
during the day it could not be approached on account of the heat and
sulphureous smell; at night it emitted an agreeable odour, appeared
brilliant at a distance, and was so hot that the sea boiled all around
it to a distance of five stadia, and appeared in a state of agitation
for twenty stadia, the heap being formed of fragments of rock as large
as towers. Both Arne and Mideia[389] have been buried in the waters of
Lake Copaïs. [390] These towns the poet in his Catalogue[391] thus speaks
of;

“Arne claims
A record next for her illustrious sons,
Vine-bearing Arne. Thou wast also there
Mideia. ”[392]

It seems that several Thracian cities have been submerged by the Lake
Bistonis,[393] and that now called Aphnitis. [394] Some also affirm that
certain cities of Trerus were also overwhelmed, in the neighbourhood of
Thrace. Artemita, formerly one of the Echinades,[395] is now part of the
mainland; the same has happened to some other of the islets near the
Achelous, occasioned, it is said, in the same way, by the alluvium
carried into the sea by that river, and Hesiod[396] assures us that a
like fate awaits them all. Some of the Ætolian promontories were
formerly islands. Asteria,[397] called by Homer Asteris, is no longer
what it was.

“There is a rocky isle
In the mid-sea, Samos the rude between
And Ithaca, not large, named Asteris.
It hath commodious havens, into which
A passage clear opens on either side. ”[398]

There is no good anchorage there now. Neither is there in Ithaca the
cavern, nor yet the temple of the nymphs described to us by Homer. It
seems more correct to attribute this to change having come over the
places, than either to the ignorance or the romancing of the poet. This
however, being uncertain, must be left to every man’s opinion.

19. Myrsilus tells us that Antissa[399] was formerly an island, and so
called because it was opposite to Lesbos,[400] then named Issa. Now,
however, it forms one of the towns of Lesbos. [401] Some have believed
that Lesbos itself has been disjoined from Mount Ida in the same way as
Prochytas[402] and Pithecussa[403] from Misenum,[404] Capreæ[405] from
the Athenæum, Sicily from Rhegium,[406] and Ossa from Olympus. [407]
Many changes similar to these have occurred elsewhere. The river Ladon
in Arcadia ceased for some time its flow. Duris informs us that the
Rhagæ[408] in Media gained that appellation from chasms made in the
ground near the Gates of the Caspian[409] by earthquakes, in which many
cities and villages were destroyed, and the rivers underwent various
changes. Ion, in his satirical composition of Omphale, has said of
Eubœa,

“The light wave of the Euripus has divided the land of Eubœa from
Bœotia; separating the projecting land by a strait. ”

20. Demetrius of Callatis, speaking of the earthquakes which formerly
occurred throughout the whole of Greece, states that a great portion of
the Lichadian Islands and of Kenæum[410] were submerged; that the hot
springs of Ædepsus[411] and Thermopylæ were suppressed for three days,
and that when they commenced to run again those of Ædepsus gushed from
new fountains. That at Oreus[412] on the sea-coast the wall and nearly
seven hundred houses fell at once. That the greater part of
Echinus,[413] Phalara,[414] and Heraclæa of Trachis[415] were thrown
down, Phalara being overturned from its very foundations. That almost
the same misfortune occurred to the Lamians[416] and inhabitants of
Larissa; that Scarpheia[417] was overthrown from its foundations, not
less than one thousand seven hundred persons being swallowed up, and at
Thronium[418] more than half that number. That a torrent of water
gushed forth taking three directions, one to Scarphe and Thronium,
another to Thermopylæ, and a third to the plains of Daphnus in Phocis.
That the springs of [many] rivers were for several days dried up; that
the course of the Sperchius[419] was changed, thus rendering navigable
what formerly were highways; that the Boagrius[420] flowed through
another channel; that many parts of Alope, Cynus, and Opus were
injured,[421] and the castle of Œum, which commands the latter city,
entirely overturned. That part of the wall of Elateia[422] was thrown
down; and that at Alponus,[423] during the celebration of the games in
honour of Ceres, twenty-five maidens, who had mounted a tower to enjoy
the show exhibited in the port, were precipitated into the sea by the
falling of the tower. They also record that a large fissure was made [by
the water] through the midst of the island of Atalanta,[424] opposite
Eubœa,[425] sufficient for ships to sail in; that the course of the
channel was in places as broad as twenty stadia between the plains; and
that a trireme being raised [thereby] out of the docks, was carried over
the walls.

21. Those who desire to instil into us that more perfect freedom from
[ignorant] wonder, which Democritus and all other philosophers so highly
extol, should add the changes which have been produced by the migrations
of various tribes: we should thus be inspired with courage, steadiness,
and composure. For instance, the Western Iberians,[426] removed to the
regions beyond the Euxine and Colchis, being separated from Armenia,
according to Apollodorus, by the Araxes,[427] but rather by the
Cyrus[428] and Moschican mountains. [429] The expedition of the Egyptians
into Ethiopia[430] and Colchis. The migration of the Heneti,[431] who
passed from Paphlagonia into the country bordering on the Adriatic Gulf.
Similar emigrations were also undertaken by the nations of Greece, the
Ionians, Dorians, Achaians, and Æolians; and the Ænians,[432] now next
neighbours to the Ætolians, formerly dwelt near Dotium[433] and Ossa,
beyond the Perrhæbi;[434] the Perrhæbi too are but wanderers here
themselves. Our present work furnishes numerous instances of the same
kind. Some of these are familiar to most readers, but the migrations of
the Carians, the Treres, the Teucrians, and the Galatæ or Gauls,[435]
are not so generally known. Nor yet for the most part are the
expeditions of their chiefs, for instance, Madys the Scythian, Tearko
the Ethiopian, Cobus of Trerus, Sesostris and Psammeticus the Egyptians;
nor are those of the Persians from Cyrus to Xerxes familiar to every
one. The Kimmerians, or a separate tribe of them, called the Treres,
have frequently overrun the countries to the right of the Euxine and
those adjacent to them, bursting now into Paphlagonia, now into Phrygia,
as they did when, according to report, Midas[436] came to his death by
drinking bull’s blood. Lygdamis led his followers into Lydia, passed
through Ionia, took Sardis, but was slain in Cilicia. The Kimmerians and
Treres frequently made similar incursions, until at last, as it is
reported, these latter, together with [their chief] Cobus, were driven
out by Madys, king of the “Scythians. ”[437] But enough has been said in
this place on the general history of the earth, as each country will
have a particular account.

22. We must now return to the point whence we digressed. Herodotus
having observed that there could be no such people as Hyperboreans,
inasmuch as there were no Hypernotii,[438] Eratosthenes calls this
argument ridiculous, and compares it to the sophism, that there are no
epichærekaki,[439] inasmuch as there are no epichæragathi;[440] [adding]
perhaps there are Hypernotii; since at all events in Ethiopia Notus does
not blow, although lower down it does.

It would indeed be strange, since winds blow under every latitude, and
especially the southern wind called Notus, if any region could be found
where this latter was not felt. On the contrary, not only does Ethiopia
experience our Notus, but also the whole country which lies above as far
as the equator. [441]

If Herodotus must be blamed at all, it is for supposing that the
Hyperboreans were so named in consequence of Boreas, or the north wind,
not blowing upon them. The poets are allowed much licence in their modes
of expression; but their commentators, who endeavour always to give us
the correct view, tell us that the people who dwelt in the extreme
north, were styled Hyperboreans. The pole is the boundary of the
northern winds, and the equator of the southern; these winds have no
other limit.

23. Eratosthenes next finds fault with the writers who fill their
narrative with stories evidently feigned and impossible; some as mere
fable, but others as history, which did not deserve mention. In the
discussion of a subject like his, he should not have wasted his time
about such trifles. Such is the way in which this writer completes the
First Book of his Memoirs.




CHAPTER IV.


1. In his Second Book Eratosthenes endeavours to correct some errors in
geography, and offers his own views on the subject, any mistakes in
which we shall endeavour in our turn to set right. He is correct in
saying that the inductions of mathematics and natural philosophy should
be employed, and that if the earth is spheroidal like the universe, it
is inhabited in all parts; together with some other things of this
nature. Later writers do not agree with him as to the size of the
earth,[442] nor admit his measurement. However Hipparchus, when noting
the celestial appearances for each particular locality, adopts his
admeasurements, saying that those taken for the meridian of Meroe,[443]
Alexandria, and the Dnieper, differ but very slightly from the truth.
Eratosthenes then enters into a long discussion concerning the figure of
the globe, proving that the form of the earth together with the water is
spheroidal, as also the heavens. This however we imagine was foreign to
his purpose, and should have been disposed of in the compass of a few
words.

2. After this he proceeds to determine the breadth of the habitable
earth: he tells us, that measuring from the meridian of Meroe[444] to
Alexandria, there are 10,000 stadia.

From thence to the Hellespont[445] about 8100. Again; from thence to
the Dnieper, 5000; and thence to the parallel of Thule,[446] which
Pytheas says is six days’ sail north from Britain, and near the Frozen
Sea, other 11,500. To which if we add 3400 stadia above Meroe in order
to include the Island of the Egyptians,[447] the Cinnamon country, and
Taprobane,[448] there will be in all 38,000 stadia.

3. We will let pass the rest of his distances, since they are something
near,—but that the Dnieper is under the same parallel as Thule, what
man in his senses could ever agree to this? Pytheas, who has given us
the history of Thule, is known to be a man upon whom no reliance can be
placed, and other writers who have seen Britain and Ierne,[449] although
they tell us of many small islands round Britain, make no mention
whatever of Thule. The length of Britain itself is nearly the same as
that of Keltica,[450] opposite to which it extends. Altogether it is not
more than 5000 stadia in length, its outermost points corresponding to
those of the opposite continent. In fact the extreme points of the two
countries lie opposite to each other, the eastern extremity to the
eastern, and the western to the western: the eastern points are situated
so close as to be within sight of each other, both at Kent and at the
mouths of the Rhine. But Pytheas tells us that the island [of Britain]
is more than 20,000 stadia in length, and that Kent is some days’ sail
from France. With regard to the locality of the Ostimii, and the
countries beyond the Rhine,[451] as far as Scythia, he is altogether
mistaken. The veracity of a writer who has been thus false in describing
countries with which we are well acquainted, should not be too much
trusted in regard to unknown places.

4. Further, Hipparchus and many others are of opinion that the parallel
of latitude of the Dnieper does not differ from that of Britain; since
that of Byzantium and Marseilles are the same. The degree of shadow from
the gnomon which Pytheas states he observed at Marseilles being exactly
equal to that which Hipparchus says he found at Byzantium; the periods
of observation being in both cases similar. [452] Now from Marseilles to
the centre of Britain is not more than 5000 stadia; and if from the
centre of Britain we advance north not more than 4000 stadia, we arrive
at a temperature in which it is scarcely possible to exist. Such indeed
is that of Ierne. [453] Consequently the far region in which Eratosthenes
places Thule must be totally uninhabitable. By what guesswork he
arrived at the conclusion that between the latitude of Thule and the
Dnieper there was a distance of 11,500 stadia I am unable to divine.

5. Eratosthenes being mistaken as to the breadth [of the habitable
earth], is necessarily wrong as to its length. The most accurate
observers, both ancient and modern, agree that the known length of the
habitable earth is more than twice its breadth. Its length I take to be
from the [eastern] extremity of India[454] to the [westernmost] point of
Spain;[455] and its breadth from [the south of] Ethiopia to the latitude
of Ierne. Eratosthenes, as we have said, reckoning its breadth from the
extremity of Ethiopia to Thule, was forced to extend its length beyond
the true limits, that he might make it more than twice as long as the
breadth he had assigned to it. He says that India, measured where it is
narrowest,[456] is 16,000 stadia to the river Indus. If measured from
its most prominent capes it extends 3000 more. [457] Thence to the
Caspian Gates, 14,000. From the Caspian Gates to the Euphrates,[458]
10,000. From the Euphrates to the Nile, 5000. [459] Thence to the
Canopic[460] mouth, 1300. From the Canopic mouth to Carthage, 13,500.
From thence to the Pillars at least 8000. Which make in all 70,800
stadia. To these [he says] should be added the curvature of Europe
beyond the Pillars of Hercules, fronting the Iberians, and inclining
west, not less than 3000 stadia, and the headlands, including that of
the Ostimii, named Cabæum,[461] and the adjoining islands, the last of
which, named Uxisama,[462] is distant, according to Pytheas, a three
days’ sail. But he added nothing to its length by enumerating these
last, viz. the headlands, including that of the Ostimii, the island of
Uxisama, and the rest; they are not situated so as affect the length of
the earth, for they all lie to the north, and belong to Keltica, not to
Iberia; indeed it seems but an invention of Pytheas. Lastly, to fall in
with the general opinion that the breadth ought not[463] to exceed half
the length, he adds to the stated measure of its length 2000 stadia
west, and as many east.

6. Further, endeavouring to support the opinion that it is in accordance
with natural philosophy to reckon the greatest dimension of the
habitable earth from east to west, he says that, according to the laws
of natural philosophy, the habitable earth ought to occupy a greater
length from east to west, than its breadth from north to south. The
temperate zone, which we have already designated as the longest zone, is
that which the mathematicians denominate a continuous circle returning
upon itself. So that if the extent of the Atlantic Ocean were not an
obstacle, we might easily pass by sea from Iberia to India,[464] still
keeping in the same parallel; the remaining portion of which parallel,
measured as above in stadia, occupies more than a third of the whole
circle: since the parallel drawn through Athens,[465] on which we have
taken the distances from India to Iberia, does not contain in the whole
200,000 stadia.

Here too his reasoning is incorrect. For this speculation respecting
the temperate zone which we inhabit, and whereof the habitable earth is
a part, devolves properly on those who make mathematics their study. But
it is not equally the province of one treating of the habitable earth.
For by this term we mean only that portion of the temperate zone where
we dwell, and with which we are acquainted. But it is quite possible
that in the temperate zone there may be two or even more habitable
earths, especially near the circle of latitude which is drawn through
Athens and the Atlantic Ocean. After this he returns to the form of the
earth, which he again declares to be spheroidal. Here he exhibits the
same churlishness we have previously pointed out, and goes on abusing
Homer in his old style. He proceeds:

7. “There has been much argument respecting the continents. Some,
considering them to be divided by the rivers Nile and Tanais,[466] have
described them as islands; while others suppose them to be peninsulas
connected by the isthmuses between the Caspian and the Euxine Seas, and
between the Erythræan Sea[467] and Ecregma. ”[468] He adds, that this
question does not appear to him to be of any practical importance, but
rather, as Democritus observed, a bone of contention for angry
litigants. Where there are no precise boundary marks, columns, or walls,
as at Colyttus and Melitè,[469] it is easy for us to say such a place is
Colyttus, and such another Melitè; but not so easy to show the exact
limits: thus disputes have frequently arisen concerning certain
districts; that, for instance, between the Argives and Lacedæmonians
concerning [the possession of] Thyrea,[470] and that between the
Athenians and Bœotians relative to Oropus. [471] Further, in giving names
to the three continents, the Greeks did not take into consideration the
whole habitable earth, but merely their own country and the land exactly
opposite, namely, Caria, which is now inhabited by the Ionians and
other neighbouring tribes. In course of time, as they advanced further
and daily became acquainted with new countries, this their division came
to be general. ”

I take this last part first, and (to use Eratosthenes’ own words, not
those of Democritus) willing to pick my bone of contention, inquire,
whether they who first made the division of the three continents were
the same persons as those who first desired to distinguish their own
land from that of the Carians opposite, or whether they were only
acquainted with Greece, Caria, and some few other adjoining countries,
and not with Europe, Asia, or Africa; but that others who followed them,
and were able to write a description of the habitable earth, were the
real authors of the division into three continents. How did he know that
these were not the men who made this division of the habitable earth?
And he who divided the earth into three parts, giving to each portion
the name of “continent,” could he not form in his mind a just idea of
that taken as a whole, which he had so parcelled out. But if indeed he
were not acquainted with the whole habitable earth, but merely made a
division of some part thereof, pray what portion of that part did he
denominate Asia, or Europe, or simply continent? Such talk is altogether
nonsense.

8. The reasoning of Eratosthenes, however, is still more absurd, when he
declares that he sees no advantage in being acquainted with the exact
boundaries of countries, and then cites the example of Colyttus and
Melitè, which prove just the contrary of his assertion. Surely if a want
of certainty respecting the boundaries of Thyrea and Oropus gave rise to
war, a knowledge of the limits of different districts must be of
practical importance. Will he tell us that the boundaries of districts,
or the limits of kingdoms, may be of some service, but when applied to
continents it is carrying the matter too far. We reply, it is of equal
consequence here. Suppose a dispute between two powerful princes, one
claiming the possession of Asia and the other of Africa, to which of
these should Egypt, I mean the country called Lower Egypt, appertain.
Will any one pass over such cases on account of their rarity? By no
means.
It is acknowledged by every one that the limits of each continent
ought to be defined by some notable boundary, indicated by the
configuration of the whole habitable earth. In following out this
principle, we should not be very particular if they who determine
boundaries by the rivers leave some districts undefined, since the
rivers do not reach from sea to sea, nor leave the continents altogether
as islands.

9. At the close of the book Eratosthenes blames the system of those who
would divide all mankind into Greeks and Barbarians, and likewise those
who recommended Alexander to treat the Greeks as friends, but the
Barbarians as enemies. [472] He suggests, as a better course, to
distinguish them according to their virtues and their vices, “since
amongst the Greeks there are many worthless characters, and many highly
civilized are to be found amongst the Barbarians; witness the Indians
and Ariani,[473] or still better the Romans and Carthaginians, whose
political system is so beautifully perfect. Alexander, considering this,
disregarded the advice which had been offered him, and patronized
without distinction any man he considered to be deserving. ” But we would
inquire whether those men who thus divided the human race, abandoning
one portion to contempt, and exalting to dignity the other, were not
actuated to this because they found that on one side justice, knowledge,
and the force of reason reigned supreme, but their contraries on the
other. Alexander did not disregard the advice tendered him, but gladly
embraced and followed it, respecting the wisdom of those who gave it;
and so far from taking the opposite course, he closely pursued that
which they pointed out.




BOOK II.

SUMMARY.


In the Second Book, having proposed for discussion the [opinions]
of Eratosthenes, he examines and refutes whatever that writer may
have incorrectly said, determined, or laid down. He likewise
brings forward many statements of Hipparchus, which he disproves,
and finishes with a short exposition or synopsis of the whole
subject, namely, geographical knowledge.




CHAPTER I.


1. In the Third Book of his Geography Eratosthenes furnishes us with a
chart of the habitable earth. This he divides into two portions, by a
line running from east to west parallel to the equator. He makes the
Pillars of Hercules the boundary of this line to the west, and to the
east the farthest ridges of those mountains which bound India on the
north. From the Pillars he draws the line through the Strait of
Sicily,[474] and the southern extremities of Peloponnesus and Attica, to
Rhodes and the Gulf of Issus. [475] He says, “Through the whole of this
distance the line mentioned is drawn across the sea[476] and adjacent
continents; the whole length of the Mediterranean as far as Cilicia
extending in that direction. Thence it runs nearly in a straight line
along the whole chain of the Taurus to India. The Taurus continuing in a
straight line from the Pillars divides Asia through its whole length
into two halves, north and south. So that both the Taurus and the sea
from the Pillars hither[477] lie under the parallel of Athens. ”

2. He then declares that the ancient geographical chart wants revision;
that in it the eastern portion of the Taurus is made to run too far
north, India itself being also too much drawn in the same direction. One
proof which he offers in support of this is, that the most southern
extremities of India are under the same latitude as Meroe, as attested
by many, both from astronomical observations and the temperature of the
climate. From thence to the most northerly point by the mountains of the
Caucasus,[478] there are 15,000 stadia, according to Patrocles, a writer
whom we are bound to believe, both on account of his worth, and the vast
amount of his geographical attainments. Now since the distance from
Meroe to the parallel of Athens is nearly the same, the most northerly
points of India next to the Caucasian mountains ought to be under the
same degree of latitude.

3. But there is another method (says Eratosthenes) of proving this. The
distance from the Gulf of Issus to the Euxine, proceeding in a northerly
direction towards Amisus[479] and Sinope,[480] is about 3000 stadia,
which is as much as the supposed extent of the mountains [of the
Taurus]. [481] The traveller who directs his course from Amisus due
east,[482] arrives first at Colchis, then at the high lands by the
Hyrcanian Sea,[483] afterwards at the road leading to Bactra,[484] and
beyond to the Scythians; having the mountains always on the right. The
same line drawn through Amisus westward, crosses the Propontis and
Hellespont. From Meroe to the Hellespont there are not more than 18,000
stadia. [485] The distance is just the same from the southern extremity
of India to the land of Bactria, if we add to the 15,000 stadia of that
country the 3000 which its mountains occupy in breadth.

4. Hipparchus tries to invalidate this view of Eratosthenes, by sneering
at the proofs on which it rests. Patrocles, he says, merits little
credit, being contradicted by the two writers Deimachus and
Megasthenes, who say that the distance[486] taken from the southern
ocean, is in some places 20,000, in others 30,000 stadia; that in this
assertion they are supported by the ancient charts, and he considers it
absurd to require us to put implicit faith in Patrocles alone, when
there is so much testimony against him; or that the ancient charts
should be corrected; but rather that they should be left as they are
until we have something more certain on the subject.

5. This argument, I think, is in many instances unfounded. Eratosthenes
availed himself of the statements of many writers, although Hipparchus
alleges he was solely led by Patrocles. Who then are the authors of the
statement that the southern extremity of India is under the same
parallel as Meroe; and who are they who estimate[487] the distance from
Meroe to the parallel passing through Athens? Or who, again, were those
who asserted that the whole breadth occupied by the mountains[488] was
equal to the distance from Cilicia to Amisus? Or who made known that,
travelling from Amisus, the course lay in a straight line due east
through Colchis, the [sea of] Hyrcania, so on to Bactria, and beyond
this to the eastern ocean,[489] the mountains being always on the right
hand; and that this same line carried west in a straight line, traverses
the Propontis and the Hellespont? These things Eratosthenes advances on
the testimony of men who had been on the spot, and from the study of
those numerous memoirs which he had for reference in that noble
library[490] which Hipparchus himself acknowledges to be gigantic.

6. Besides, the credibility of Patrocles can be proved by a variety of
evidence—the princes[491] who confided to him so important trusts—the
authors who follow his statements—and those, too, who criticise them,
whose names Hipparchus has recorded. Since whenever these are refuted,
the credit of Patrocles is by so much advanced. Nor does Patrocles
appear to state any thing improbable when he says that the army of
Alexander took but a very hasty view of every thing [in India], but
Alexander himself a more exact one, causing the whole country to be
described by men well acquainted with it. Which description he says was
afterwards put into his hands by Xenocles the treasurer.

7. Again, in the second volume of his Commentaries, Hipparchus accuses
Eratosthenes of himself throwing discredit on the statement of
Patrocles, on account of his differing with Megasthenes, as to the
length of India on its northern side;[492] Megasthenes stating the
length at 16,000 stadia, and Patrocles at 1000 less. Being biased by a
certain Itinerary, Eratosthenes was led to reject them both on account
of this discrepancy, and to follow the Itinerary. If then merely the
difference of 1000 stadia is sufficient to cause the authority of
Patrocles to be rejected, how much more should this be the case when we
find a difference of 8000 stadia between his statement and that of two
writers who agree perfectly in theirs, that the breadth of India is
20,000 stadia, while he gives only 12,000!

8. We reply, that [Eratosthenes] did not object [to the statement of
Patrocles] merely because it differed [from that of Megasthenes], but
because the statement of this latter as to the stadia was confirmed by
the Itinerary, an authority of no mean importance. There is nothing
wonderful in this, that though a certain statement may be credible,
another may be more credible; and that while in some instances we follow
the former, in others we may dissent from it on finding a more
trustworthy guide. It is ridiculous to say that the greater the
difference of one writer from others, the less he should be trusted. On
the contrary, such a rule would be more applicable in regard to small
differences; for in little particulars the ordinary observer and the man
of great ability are equally liable to err. On the other hand, in great
matters, the ordinary run of men are more like to be deceived than the
man of superior talent, to whom consequently in such cases greater
deference is paid.

9. Generally speaking, the men who hitherto have written on the affairs
of India, were a set of liars. Deimachus holds the first place in the
list, Megasthenes comes next, while Onesicritus and Nearchus, with
others of the same class, manage to stammer out a few words [of truth].
Of this we became the more convinced whilst writing the history of
Alexander. No faith whatever can be placed in Deimachus and Megasthenes.
They coined the fables concerning men with ears large enough to sleep
in, men without any mouths, without noses, with only one eye, with
spider-legs, and with fingers bent backward. They renewed Homer’s fable
concerning the battles of the Cranes and Pygmies, and asserted the
latter to be three spans high. They told of ants digging for gold, of
Pans with wedge-shaped heads, of serpents swallowing down oxen and
stags, horns and all; meantime, as Eratosthenes has observed,
reciprocally accusing each other of falsehood. Both of these men were
sent ambassadors to Palimbothra,[493]—Megasthenes to Sandrocottus,
Deimachus to Allitrochades his son; and such are the notes of their
residence abroad, which, I know not why, they thought fit to leave.
Patrocles certainly does not resemble them; nor do any other of the
authorities consulted by Eratosthenes contain such absurdities.

10. [494]If the meridian of Rhodes and Byzantium has been rightly
determined to be the same, then that of Cilicia and Amisus has likewise
been rightly determined; many observations having proved that the lines
are parallel, and that they never impinge on each other.

11. In like manner, that the voyage from Amisus to Colchis, and the
route to the Caspian, and thence on to Bactra, are both due east, is
proved by the winds, the seasons, the fruits, and even the sun-risings.
Frequently evidence such as this, and general agreement, are more to be
relied on than the measurement taken by means of instruments. Hipparchus
himself was not wholly indebted to instruments and geometrical
calculations for his statement that the Pillars and Cilicia lie in a
direct line due east. For that part of it included between the Pillars
and the Strait of Sicily he rests entirely on the assertion of sailors.
It is therefore incorrect to say that, because we cannot exactly
determine the duration of the longest and shortest days, nor the degree
of shadow of the gnomon throughout the mountainous region between
Cilicia and India, that therefore we are unable to decide whether the
line traced obliquely on the ancient charts should or should not be
parallel, and consequently must leave it unreformed, keeping it oblique
as the ancient charts have it. For in the first place, not to determine
any thing is to leave it undetermined; and to leave a thing
undetermined, is neither to take one view of the matter nor the other:
but to agree to leave it as the ancients have, that is to take a view of
the case. It would have been more consistent with his reasoning, if he
had told us to leave Geography alone altogether, since we are similarly
unable to determine the position of the Alps, the Pyrenees, and the
mountains of Thrace,[495] Illyria,[496] and Germany. Wherefore should we
give more credit to the ancient writers than to the modern, when we call
to mind the numerous errors of their charts which have been pointed out
by Eratosthenes, and which Hipparchus has not attempted to defend.

12. But the system of Hipparchus altogether teems with difficulties.
Reflect for an instant on the following absurdity; after admitting that
the southern extremity of India is under the same degree of latitude as
Meroe, and that the distance from Meroe to the Strait of Byzantium is
about 18,000[497] stadia, he then makes the distance from the southern
extremity of India to the mountains 30,000 stadia. Since Byzantium and
Marseilles are under the same parallel of latitude, as Hipparchus tells
us they are, on the authority of Pytheas, and since Byzantium and the
Dnieper[498] have also the same meridian, as Hipparchus equally assures
us, if we take his assertion that there is a distance of 3700[499]
stadia between Byzantium and the Dnieper, there will of course be a like
difference between the latitude of Marseilles and the Dnieper. This
would make the latitude of the Dnieper identical with that of Keltica
next the Ocean; for on proceeding 3700 stadia [north of Marseilles], we
reach the ocean. [500]

13. Again, we know that the Cinnamon Country is the most southerly point
of the habitable earth. According to Hipparchus’s own statement, the
latitude of this country, which marks the commencement of the temperate
zone, and likewise of the habitable earth, is distant from the equator
about 8800 stadia. [501] And since he likewise says that from the equator
to the parallel of the Dnieper there are 34,000 stadia, there will
remain a distance of 25,200 stadia between the parallel of the Dnieper
(which is the same as that which passes over the side of Keltica next
the Ocean) to that which separates the torrid from the temperate zone.
It is said that the farthest voyages now made north of Keltica are to
Ierne,[502] which lies beyond Britain, and, on account of its extreme
cold, barely sustains life; beyond this it is thought to be
uninhabitable. Now the distance between Keltica and Ierne is estimated
at not more than 5000 stadia; so that on this view they must have
estimated the whole breadth of the habitable earth at 30,000 stadia, or
just above.

14. Let us then transport ourselves to the land opposite the Cinnamon
Country, and lying to the east under the same parallel of latitude; we
shall there find the country named Taprobane. [503] This Taprobane is
universally believed to be a large island situated in the high seas, and
lying to the south opposite India. Its length in the direction of
Ethiopia is above 5000 stadia, as they say. There are brought from
thence to the Indian markets, ivory, tortoise-shells, and other wares in
large quantities. Now if this island is broad in proportion to its
length, we cannot suppose that the whole distance,[504] inclusive of the
space which separates it from India, is less than 3000 stadia, which is
equal to the distance of the [southern] extremity of the habitable earth
from Meroe, since the [southern] extremities of India and Meroe are
under the same parallel. It is likely there are more than 3000
stadia,[505] but taking this number, if we add thereto the 30,000
stadia, which Deimachus states there are between [the southern extremity
of India] and the country of the Bactrians and Sogdians, we shall find
both of these nations lie beyond the temperate zone and habitable
earth. [506] Who will venture to affirm such to be the case, hearing, as
they must, the statement made both by ancients and moderns of the genial
climate and fertility of northern India, Hyrcania, Aria, Margiana,[507]
and Bactriana also? These countries are all equally close to the
northern side of the Taurus, Bactriana being contiguous to that part of
the chain[508] which forms the boundary of India. A country blessed with
such advantages must be very far from uninhabitable. It is said that in
Hyrcania each vine produces a metrete[509] of wine, and each fig tree 60
medimni[510] of fruit. That the grains of wheat which fall from the husk
on to the earth spring up the year following; that bee-hives are in the
trees, and the leaves flow with honey. The same may be met with in the
part of Media called Matiana,[511] and also in Sacasena and Araxena,
countries of Armenia. In these three it is not so much to be wondered
at, since they lie more to the south than Hyrcania, and surpass the rest
of the country in the beauty of their climate; but in Hyrcania it is
more remarkable. It is said that in Margiana you may frequently meet
with a vine whose stock would require two men with outstretched arms to
clasp it, and clusters of grapes two cubits long. Aria is described as
similarly fertile, the wine being still richer, and keeping perfectly
for three generations in unpitched casks. Bactriana, which adjoins Aria,
abounds in the same productions, if we except olives.

15. That there are cold regions in the high and mountainous parts of
these countries is not to be wondered at; since in the [more] southern
climates the mountains, and even the tablelands, are cold. The districts
next the Euxine, in Cappadocia, are much farther north than those
adjoining the Taurus. Bagadania, a vast plain, situated between the
mountains of Argæus[512] and Taurus, hardly produces any fruit trees,
although south of the Euxine Sea by 3000 stadia; while the territory
round Sinope,[513] Amisus,[514] and Phanarœa abounds in olives.

The Oxus,[515] which divides Bactriana from Sogdiana, is said to be of
such easy navigation that the wares of India are brought up it into the
sea of Hyrcania,[516] and thence successively by various other rivers to
the districts near the Euxine. [517]

16. Can one find any fertility to compare with this near to the Dnieper,
or that part of Keltica next the ocean,[518] where the vine either does
not grow at all, or attains no maturity. [519] However, in the more
southerly portions of these districts,[520] close to the sea, and those
next the Bosphorus,[521] the vine brings its fruit to maturity, although
the grapes are exceedingly small, and the vines are covered up all the
winter. And in the parts near the mouth of the Palus Mæotis, the frost
is so strong that a general of Mithridates defeated the barbarians here
in a cavalry engagement during the winter, and on the very same spot in
a naval fight in summer, when the ice was thawed. Eratosthenes furnishes
us with the following inscription, which he found in the temple of
Æsculapius at Panticapæeon,[522] on a brazen vase which had been broken
by the frost:—

“If any one doubts the intensity of our winter’s cold, let him believe
when he sees this vase. The priest Stratius placed it here, not because
he considered it a worthy offering to the god, but as a proof of the
severity of our winter. ”

Since therefore the provinces we have just enumerated [are so superior
in climate, that they] cannot be compared with the countries surrounding
the Bosphorus, nor even the regions of Amisus and Sinope, (for every one
will admit that they are much superior to these latter,) it would be
idle to compare them with the districts near the Borysthenes and the
north of Keltica; for we have shown that their temperature is not so low
as Amisus, Sinope, Byzantium, and Marseilles, which are universally
acknowledged to be 3700 stadia south of the Dnieper and Keltica.

17. If the followers of Deimachus add to the 30,000 stadia the distance
to Taprobane and the boundaries of the torrid zone, which cannot be
reckoned less than 4000 stadia,[523] they will then remove Bactria and
Aria from their actual localities and place them 34,000 stadia from the
torrid zone, a distance equal to that which Hipparchus states to be
between the equator and [the mouth of] the Dnieper, and the two
countries will therefore be removed 8800 stadia north of [the mouth of]
the Dnieper and Keltica; for there are reckoned to be 8800 stadia from
the equator to the parallel of latitude which separates the temperate
from the torrid zone and which crosses the Cinnamon Country. [524] We
have proved that the regions not more than 5000 stadia north of Keltica,
as far as Ierne,[525] are scarcely habitable, but their reasoning leads
to the conclusion that there is another circle fitted for the habitation
of man, although 3800 stadia north of Ierne. [526] And that Bactra is
still farther north than the mouth of the Caspian or Hyrcanian Sea,
which is distant about 6000 stadia from the recess of the Caspian and
the mountains of Armenia and Media, and which appears to be the most
northerly point of the whole coast as far as India, with a sea navigable
to India all the way, as Patrocles, who had the government of these
regions, affirms. Now Bactriana stretches 1000 stadia farther north.
Beyond this the Scythians occupy a much larger territory, bounded by the
Northern Ocean: here they dwell, though to be sure theirs is a nomade
life. But we ask how they could exist here at all, supposing even Bactra
to be beyond the limits of the habitable globe. The distance from the
Caucasus to the Northern Sea through Bactra would be rather more than
4000 stadia. [527] This being added to the number[528] of stadia north of
Ierne[529] above-mentioned, will give us the whole amount of
uninhabitable land from Ierne northward 7800 stadia, and even omitting
the 4000 stadia altogether, those parts of Bactriana next the Caucasus
will still be 3800 stadia farther north than Ierne, and 8800 farther
north than Keltica,[530] and [the mouth] of the Dnieper.

18. Hipparchus narrates that at the Dnieper and [the north of] Keltica,
during the whole of the summer nights there is one continued twilight
from sunset to sunrise, but at the winter solstice the sun never rises
more than nine cubits above the horizon. [531] He adds that this
phenomenon is yet more remarkable in regions 6300[532] stadia north of
Marseilles, (these regions he supposes to be peopled by Kelts, but I
believe are inhabited by Britons, and 2500 stadia north of Keltica,)
where the sun at the winter solstice[533] rises only six cubits above
the horizon. That at 9100[534] stadia north of Marseilles it only rises
four cubits, and not so much as three in the countries beyond, and which
I consider much farther north than Ierne. [535] However, Hipparchus, on
the authority of Pytheas, places them south of Britain, and says that
the longest day there consists only of 19 hours;[536] while in countries
where the sun rises but four cubits above the horizon, and which are
situated 9100[537] stadia north of Marseilles, the day has 18 hours.
Consequently [according to his hypothesis] the most southerly parts of
Britain must be north of these regions. They must therefore be under the
same parallel, or almost the same, as the parts of Bactriana next to the
Caucasus, which I have shown are, according to the followers of
Deimachus, 3800 stadia farther north than Ierne. [538] Now if we add this
to the number between Marseilles and Ierne, we shall get 12,500 stadia.
But who ever made known to us that, in those parts, I mean, in the
vicinity of Bactra, this was the duration of the longest day, or the
height which the sun attains in the meridian at the winter solstice? All
these things are patent to the eyes of every man, and require no
mathematical investigation; therefore they certainly would have been
mentioned by numerous writers both amongst the ancients who have left us
histories of Persia, and by the later writers too, who have carried them
down to our own time. How, too, would their fertility, which I have
described above, harmonize with such a latitude? The facts here advanced
are sufficient to give an idea of the learned manner in which Hipparchus
attempts to controvert the reasoning of Eratosthenes by mere petitiones
principii.

19. Again, Eratosthenes wished to show the ignorance of Deimachus, and
his want of information concerning such matters, as proved by his
assertion that India lies between the autumnal equinox[539] and winter
tropic. [540] Also in his blaming Megasthenes, where he says that in the
southern parts of India the Greater and Lesser Bear are seen to set, and
the shadows to fall both ways; assuring us that such is not the case in
India. [541] These assertions, says Eratosthenes, arise from the
ignorance of Deimachus. For it is nothing else than ignorance to suppose
that the autumnal equinox is not equally distant from the tropics with
the vernal; since in both equinoxes the sun rises at the same point, and
performs a similar revolution. Further, [he continues,] the distance
from the terrestrial tropic to the equator, between which, according to
Deimachus himself, India is situated, has been proved by measurement to
be much less than 20,000 stadia, consequently his own statements prove
that my assertion is correct, and not his. For supposing India to be
twenty or thirty thousand stadia [in breadth] it could not be contained
in the given space, but if my estimate be taken it is simple enough. It
is another evidence of his want of information, to say that the two
Bears are not seen to set, or the shadows to fall both ways, in any part
of India, since 5000 stadia south of Alexandria[542] both of these
phenomena are observable. Thus reasons Eratosthenes; whom Hipparchus
again criticises in the same mistaken way. First he substitutes [in the
text of Deimachus] the summer in place of the winter tropic; then he
says that the evidence of a man ignorant of astronomy ought not to be
received in a mathematical question; as if Eratosthenes in the main had
actually been guided by the authority of Deimachus. Could he not see
that Eratosthenes had followed the general custom in regard to idle
reasoners, one means of refuting whom is to show that their arguments,
whatever they may be, go only to confirm our views.

20. It is by assuming as a fact that the southern extremity of India is
under the same parallel as Meroe, a thing affirmed and believed by most
writers, that we shall be best able to show the absurdities of the
system of Hipparchus. In the first book of his Commentaries he does not
object to this hypothesis, but in the second book he no longer admits
it; we must examine his reasons for this. He says, “when two countries
are situated under the same parallel, but separated by a great distance,
you cannot be certain that they are exactly under the same parallel,
unless the _climata_[543] of both the places are found to be similar.
Now Philo, in his account of a voyage by sea to Ethiopia, has given us
the _clima_ of Meroe. He says that at that place the sun is vertical
forty-five days before the summer solstice,[544] he also informs us of
the proportion of shadow thrown by the gnomon both at the equinoxes and
solstices. Eratosthenes agrees almost exactly with Philo. But not a
single writer, not even Eratosthenes, has informed us of the _clima_ of
India; but if it is the case, as many are inclined to believe on the
authority of Nearchus,[545] that the two Bears are seen to set in that
country, then certainly Meroe and the southern extremity of India cannot
be under the same parallel. ”[546] [Such is the reasoning of Hipparchus,
but we reply,] If Eratosthenes confirms the statement of those authors
who tell us that in India the two Bears are observed to set, how can it
be said that not a single person, not even Eratosthenes, has informed us
of any thing concerning the _clima_ of India? This is itself information
on that point. If, however, he has not confirmed this statement, let him
be exonerated from the error. Certain it is he never did confirm the
statement. Only when Deimachus affirmed that there was no place in India
from which the two Bears might be seen to set, or the shadows fall both
ways, as Megasthenes had asserted, Eratosthenes thereupon taxed him with
ignorance, regarding as absolutely false this two-fold assertion, one
half of which, namely, that concerning the shadows not falling both
ways, Hipparchus himself acknowledged to be false; for if the southern
extremity of India were not under the same parallel as Meroe, still
Hipparchus appears to have considered it south of Syene.

21. In the instances which follow, Hipparchus, treating of these
subjects, either asserts things similar to those which we have already
refuted, or takes for granted matters which are not so, or draws
improper sequences. For instance, from the computation [of Eratosthenes]
that the distance from Babylon to Thapsacus[547] is 4800 stadia, and
thence northward to the mountains of Armenia[548] 2100 stadia more, it
does not follow that, starting from the meridian of that city, the
distance to the northern mountains is above 6000 stadia. Besides,
Eratosthenes never says that the distance from Thapsacus to these
mountains is 2100 stadia, but that a part thereof has never yet been
measured; so that this argument [of Hipparchus], founded on a false
hypothesis, amounts to nothing. Nor did Eratosthenes ever assert that
Thapsacus lies more than 4500 stadia north of Babylon.

22. Again, Hipparchus, ever anxious to defend the [accuracy of the]
ancient charts, instead of fairly stating the words of Eratosthenes
concerning his third section of the habitable earth, wilfully makes him
the author of an assertion easy of disproof. For Eratosthenes, following
the opinion we before mentioned, that a line drawn from the Pillars of
Hercules across the Mediterranean, and the length of the Taurus, would
run due west and east,[549] divides, by means of this line, the
habitable earth into two portions, which he calls the northern and
southern divisions; each of these he again essays to subdivide into as
many smaller partitions as practicable, which he denominates
sections. [550] He makes India the first section of the southern part,
and Ariana[551] the second; these two countries possessing a good
outline, he has been able not only to give us an accurate statement of
their length and breadth, but an almost geometrically exact description
of their figure. He tells us that the form of India is rhomboidal, being
washed on two of its sides by the southern and eastern oceans
[respectively], which do not deeply indent its shores. The two remaining
sides are contained by its mountains and the river [Indus], so that it
presents a kind of rectilinear figure. [552] As to Ariana, he considered
three of its sides well fitted to form a parallelogram; but of the
western side he could give no regular definition, as it was inhabited by
various nations; nevertheless he attempts an idea of it by a line drawn
from the Caspian Gates[553] to the limits of Carmania, which border on
the Persian Gulf. This side he calls western, and that next the Indus
eastern, but he does not tell us they are parallel to each other;
neither does he say this of the other sides, one bounded by the
mountains, and the other by the sea; he simply calls them north and
south.

23. Having in this manner but imperfectly traced the outlines of his
second section, the third section, for various reasons, is still less
exact. The first cause has been already explained, viz. that the line
from the Caspian Gates to Carmania is not clearly defined, as the side
of the section is common both to the third and second sections.
Secondly, on account of the Persian Gulf interrupting the continuity of
the southern side, as he himself tells us, he has been obliged to take
the measured road running through Susa and Persepolis to the boundaries
of Carmania and Persia, and suppose it straight. [554] This road, which
he calls the southern side, is a little more than 9000 stadia. He does
not, however, tell us, that it runs parallel to the northern side. It is
also clear that the Euphrates, which he makes the western boundary, is
any thing but a straight line. On leaving the mountains it flows south,
but soon shifts its course to the east; it then again pursues a
southerly direction till it reaches the sea. In fact, Eratosthenes
himself acknowledges the indirect course of this river, when he compares
the shape of Mesopotamia, which is formed by the junction of the Tigris
and Euphrates, to the cushion on a rower’s bench. The western side
bounded by the Euphrates is not entirely measured; for he tells us that
he does not know the extent of the portion between Armenia and the
northern mountains,[555] as it has not been measured. By reason of these
hinderances he states that he has been only able to give a very
superficial view of the third section, and that his estimate of the
distances is borrowed from various Itineraries, some of them, according
to his own description, anonymous. Hipparchus therefore must be
considered guilty of unfairness, for criticising with geometrical
precision a work of this general nature. We ought rather to be grateful
to a person who gives us any description at all of the character of such
[unknown] places. But when he urges his geometrical objections not
against any real statement of Eratosthenes, but merely against imaginary
hypotheses of his own creation, he shows too plainly the contradictory
bent of his mind.

24. It is in this general kind of description of the third section that
Eratosthenes supposes 10,000 stadia from the Caspian Gates to the
Euphrates. This he again divides according to former admeasurements
which he found preserved. Starting from the point where the Euphrates
passes near to Thapsacus, he computes from thence to the place where
Alexander crossed the Tigris 2400 stadia. The route thence through
Gaugamela,[556] the Lycus,[557] Arbela,[558] and Ecbatana,[559] whither
Darius fled from Gaugamela to the Caspian Gates, makes up the 10,000
stadia, which is only 300 stadia too much. Such is the measure of the
northern side given by Eratosthenes, which he could not have supposed to
be parallel to the mountains, nor yet to the line drawn from the Pillars
of Hercules through Athens and Rhodes. For Thapsacus is far removed from
the mountains, and the route from Thapsacus to the Caspian Gates only
falls in with the mountains at that point. [560] Such is the boundary on
the northern side.