No More Learning

Its legs are hairy; it is cloven-footed, and the tail,
which resembles that of the ox, seems not big enough for the size of
its body. It tosses up dust and scoops out the ground with its hooves,
like the bull. Its skin is impervious to blows. Owing to the savour of
its flesh it is sought for in the chase. When it is wounded it runs
away, and stops only when thoroughly exhausted. It defends itself
against an assailant by kicking and projecting its excrement to a
distance of eight yards; this device it can easily adopt over and over
again, and the excrement is so pungent that the hair of hunting-dogs
is burnt off by it. It is only when the animal is disturbed or alarmed
that the dung has this property; when the animal is undisturbed it has
no blistering effect. So much for the shape and habits of the
animal. When the season comes for parturition the mothers give birth
to their young in troops upon the mountains. Before dropping their
young they scatter their dung in all directions, making a kind of
circular rampart around them; for the animal has the faculty of
ejecting excrement in most extraordinary quantities.

46

Of all wild animals the most easily tamed and the gentlest is
the elephant. It can be taught a number of tricks, the drift and
meaning of which it understands; as, for instance, it can taught to
kneel in presence of the king. It is very sensitive, and possessed
of an intelligence superior to that of other animals. When the male
has had sexual union with the female, and the female has conceived,
the male has no further intercourse with her.

Some say that the elephant lives for two hundred years;
others, for one hundred and twenty; that the female lives nearly as
long as the male; that they reach their prime about the age of
sixty, and that they are sensitive to inclement weather and frost. The
elephant is found by the banks of rivers, but he is not a river
animal; he can make his way through water, as long as the tip of his
trunk can be above the surface, for he blows with his trunk and
breathes through it. The animal is a poor swimmer owing to the heavy
weight of his body.

47

The male camel declines intercourse with its mother; if his keeper
tries compulsion, he evinces disinclination. On one occasion, when
intercourse was being declined by the young male, the keeper covered
over the mother and put the young male to her; but, when after the
intercourse the wrapping had been removed, though the operation was
completed and could not be revoked, still by and by he bit his
keeper to death. A story goes that the king of Scythia had a
highly-bred mare, and that all her foals were splendid; that wishing
to mate the best of the young males with the mother, he had him
brought to the stall for the purpose; that the young horse declined;
that, after the mother's head had been concealed in a wrapper he, in
ignorance, had intercourse; and that, when immediately afterwards
the wrapper was removed and the head of the mare was rendered visible,
the young horse ran way and hurled himself down a precipice.

48

Among the sea-fishes many stories are told about the dolphin,
indicative of his gentle and kindly nature, and of manifestations of
passionate attachment to boys, in and about Tarentum, Caria, and other
places. The story goes that, after a dolphin had been caught and
wounded off the coast of Caria, a shoal of dolphins came into the
harbour and stopped there until the fisherman let his captive go free;
whereupon the shoal departed. A shoal of young dolphins is always,
by way of protection, followed by a large one. On one occasion a shoal
of dolphins, large and small, was seen, and two dolphins at a little
distance appeared swimming in underneath a little dead dolphin when it
was sinking, and supporting it on their backs, trying out of
compassion to prevent its being devoured by some predaceous fish.
Incredible stories are told regarding the rapidity of movement of this
creature. It appears to be the fleetest of all animals, marine and
terrestrial, and it can leap over the masts of large vessels. This
speed is chiefly manifested when they are pursuing a fish for food;
then, if the fish endeavours to escape, they pursue him in their
ravenous hunger down to deep waters; but, when the necessary return
swim is getting too long, they hold in their breath, as though
calculating the length of it, and then draw themselves together for an
effort and shoot up like arrows, trying to make the long ascent
rapidly in order to breathe, and in the effort they spring right
over the a ship's masts if a ship be in the vicinity. This same
phenomenon is observed in divers, when they have plunged into deep
water; that is, they pull themselves together and rise with a speed
proportional to their strength. Dolphins live together in pairs,
male and female. It is not known for what reason they run themselves
aground on dry land; at all events, it is said that they do so at
times, and for no obvious reason.

49

Just as with all animals a change of action follows a change
of circumstance, so also a change of character follows a change of
action, and often some portions of the physical frame undergo a
change, occurs in the case of birds. Hens, for instance, when they
have beaten the cock in a fight, will crow like the cock and endeavour
to tread him; the crest rises up on their head and the tail-feathers
on the rump, so that it becomes difficult to recognize that they are
hens; in some cases there is a growth of small spurs. On the death
of a hen a cock has been seen to undertake the maternal duties,
leading the chickens about and providing them with food, and so intent
upon these duties as to cease crowing and indulging his sexual
propensities. Some cock-birds are congenitally so feminine that they
will submit patiently to other males who attempt to tread them.

50

Some animals change their form and character, not only at
certain ages and at certain seasons, but in consequence of being
castrated; and all animals possessed of testicles may be submitted
to this operation. Birds have their testicles inside, and oviparous
quadrupeds close to the loins; and of viviparous animals that walk
some have them inside, and most have them outside, but all have them
at the lower end of the belly. Birds are castrated at the rump at
the part where the two sexes unite in copulation. If you burn this
twice or thrice with hot irons, then, if the bird be full-grown, his
crest grows sallow, he ceases to crow, and foregoes sexual passion;
but if you cauterize the bird when young, none of these male
attributes propensities will come to him as he grows up. The case is
the same with men: if you mutilate them in boyhood, the
later-growing hair never comes, and the voice never changes but
remains high-pitched; if they be mutilated in early manhood, the
late growths of hair quit them except the growth on the groin, and
that diminishes but does not entirely depart. The congenital growths
of hair never fall out, for a eunuch never grows bald. In the case
of all castrated or mutilated male quadrupeds the voice changes to the
feminine voice. All other quadrupeds when castrated, unless the
operation be performed when they are young, invariably die; but in the
case of boars, and in their case only, the age at which the
operation is performed produces no difference. All animals, if
operated on when they are young, become bigger and better looking than
their unmutilated fellows; if they be mutilated when full-grown,
they do not take on any increase of size. If stags be mutilated, when,
by reason of their age, they have as yet no horns, they never grow
horns at all; if they be mutilated when they have horns, the horns
remain unchanged in size, and the animal does not lose them. Calves
are mutilated when a year old; otherwise, they turn out uglier and
smaller. Steers are mutilated in the following way: they turn the
animal over on its back, cut a little off the scrotum at the lower
end, and squeeze out the testicles, then push back the roots of them
as far as they can, and stop up the incision with hair to give an
outlet to suppurating matter; if inflammation ensues, they cauterize
the scrotum and put on a plaster. If a full-grown bull be mutilated,
he can still to all appearance unite sexually with the cow. The
ovaries of sows are excised with the view of quenching in them
sexual appetites and of stimulating growth in size and fatness. The
sow has first to be kept two days without food, and, after being
hung up by the hind legs, it is operated on; they cut the lower belly,
about the place where the boars have their testicles, for it is
there that the ovary grows, adhering to the two divisions (or horns)
of the womb; they cut off a little piece and stitch up the incision.
Female camels are mutilated when they are wanted for war purposes, and
are mutilated to prevent their being got with young. Some of the
inhabitants of Upper Asia have as many as three thousand camels:
when they run, they run, in consequence of the length of their stride,
much quicker than the horses of Nisaea. As a general rule, mutilated
animals grow to a greater length than the unmutilated.

All animals that ruminate derive profit and pleasure from the
process of rumination, as they do from the process of eating. It is
the animals that lack the upper teeth that ruminate, such as kine,
sheep, and goats. In the case of wild animals no observation has
been possible; save in the case of animals that are occasionally
domesticated, such as the stag, and it, we know, chews the cud. All
animals that ruminate generally do so when lying down on the ground.
They carry on the process to the greatest extent in winter, and
stall-fed ruminants carry it on for about seven months in the year;
beasts that go in herds, as they get their food out of doors, ruminate
to a lesser degree and over a lesser period. Some, also, of the
animals that have teeth in both jaws ruminate; as, for instance, the
Pontic mice, and the fish which from the habit is by some called
'the Ruminant', (as well as other fish).

Long-limbed animals have loose faeces, and broad-chested animals
vomit with comparative facility, and these remarks are, in a general
way, applicable to quadrupeds, birds, and men.

49B

A considerable number of birds change according to season the
colour of their plumage and their note; as, for instance, the owsel
becomes yellow instead of black, and its note gets altered, for in
summer it has a musical note and in winter a discordant chatter. The
thrush also changes its colour; about the throat it is marked in
winter with speckles like a starling, in summer distinctly spotted:
however, it never alters its note. The nightingale, when the hills are
taking on verdure, sings continually for fifteen days and fifteen
nights; afterwards it sings, but not continuously. As summer
advances it has a different song, not so varied as before, nor so
deep, nor so intricately modulated, but simple; it also changes its
colour, and in Italy about this season it goes by a different name. It
goes into hiding, and is consequently visible only for a brief period.

The erithacus (or redbreast) and the so-called redstart change into
one another; the former is a winter bird, the latter a summer one, and
the difference between them is practically limited to the coloration
of their plumage. In the same way with the beccafico and the blackcap;
these change into one another. The beccafico appears about autumn, and
the blackcap as soon as autumn has ended. These birds, also, differ
from one another only in colour and note; that these birds, two in
name, are one in reality is proved by the fact that at the period when
the change is in progress each one has been seen with the change as
yet incomplete. It is not so very strange that in these cases there is
a change in note and in plumage, for even the ring-dove ceases to
coo in winter, and recommences cooing when spring comes in; in winter,
however, when fine weather has succeeded to very stormy weather,
this bird has been known to give its cooing note, to the
astonishment of such as were acquainted with its usual winter silence.
As a general rule, birds sing most loudly and most diversely in the
pairing season. The cuckoo changes its colour, and its note is not
clearly heard for a short time previous to its departure. It departs
about the rising of the Dog-star, and it reappears from springtime
to the rising of the Dog-star. At the rise of this star the bird
called by some oenanthe disappears, and reappears when it is
setting: thus keeping clear at one time of extreme cold, and at
another time of extreme heat. The hoopoe also changes its colour and
appearance, as Aeschylus has represented in the following lines:-

The Hoopoe, witness to his own distress,

Is clad by Zeus in variable dress:-

Now a gay mountain-bird, with knightly crest,

Now in the white hawk's silver plumage drest,

For, timely changing, on the hawk's white wing

He greets the apparition of the Spring.

Thus twofold form and colour are conferred,

In youth and age, upon the selfsame bird.

The spangled raiment marks his youthful days,

The argent his maturity displays;

And when the fields are yellow with ripe corn

Again his particoloured plumes are worn.

But evermore, in sullen discontent,

He seeks the lonely hills, in self-sought banishment.

Of birds, some take a dust-bath by rolling in dust, some take
a water-bath, and some take neither the one bath nor the other.
Birds that do not fly but keep on the ground take the dust-bath, as
for instance the hen, the partridge, the francolin, the crested
lark, the pheasant; some of the straight-taloned birds, and such as
live on the banks of a river, in marshes, or by the sea, take a
water-bath; some birds take both the dust-bath and the waterbath, as
for instance the pigeon and the sparrow; of the crooked-taloned
birds the greater part take neither the one bath nor the other. So
much for the ways of the above-mentioned, but some birds have a
peculiar habit of making a noise at their hinder quarters, as, for
instance, the turtle-dove; and they make a violent movement of their
tails at the same time that they produce this peculiar sound.

-THE END-
.

350 BC

CATEGORIES

by Aristotle

translated by E. M. Edghill

1

Things are said to be named 'equivocally' when, though they have a
common name, the definition corresponding with the name differs for
each. Thus, a real man and a figure in a picture can both lay claim to
the name 'animal'; yet these are equivocally so named, for, though
they have a common name, the definition corresponding with the name
differs for each. For should any one define in what sense each is an
animal, his definition in the one case will be appropriate to that
case only.

On the other hand, things are said to be named 'univocally' which
have both the name and the definition answering to the name in common.
A man and an ox are both 'animal', and these are univocally so
named, inasmuch as not only the name, but also the definition, is
the same in both cases: for if a man should state in what sense each
is an animal, the statement in the one case would be identical with
that in the other.

Things are said to be named 'derivatively', which derive their
name from some other name, but differ from it in termination. Thus the
grammarian derives his name from the word 'grammar', and the
courageous man from the word 'courage'.

2

Forms of speech are either simple or composite. Examples of the
latter are such expressions as 'the man runs', 'the man wins'; of the
former 'man', 'ox', 'runs', 'wins'.

Of things themselves some are predicable of a subject, and are never
present in a subject. Thus 'man' is predicable of the individual
man, and is never present in a subject.

By being 'present in a subject' I do not mean present as parts are
present in a whole, but being incapable of existence apart from the
said subject.

Some things, again, are present in a subject, but are never
predicable of a subject. For instance, a certain point of
grammatical knowledge is present in the mind, but is not predicable of
any subject; or again, a certain whiteness may be present in the
body (for colour requires a material basis), yet it is never
predicable of anything.

Other things, again, are both predicable of a subject and present in
a subject. Thus while knowledge is present in the human mind, it is
predicable of grammar.

There is, lastly, a class of things which are neither present in a
subject nor predicable of a subject, such as the individual man or the
individual horse. But, to speak more generally, that which is
individual and has the character of a unit is never predicable of a
subject. Yet in some cases there is nothing to prevent such being
present in a subject. Thus a certain point of grammatical knowledge is
present in a subject.

3

When one thing is predicated of another, all that which is
predicable of the predicate will be predicable also of the subject.
Thus, 'man' is predicated of the individual man; but 'animal' is
predicated of 'man'; it will, therefore, be predicable of the
individual man also: for the individual man is both 'man' and
'animal'.

If genera are different and co-ordinate, their differentiae are
themselves different in kind. Take as an instance the genus 'animal'
and the genus 'knowledge'. 'With feet', 'two-footed', 'winged',
'aquatic', are differentiae of 'animal'; the species of knowledge
are not distinguished by the same differentiae. One species of
knowledge does not differ from another in being 'two-footed'.

But where one genus is subordinate to another, there is nothing to
prevent their having the same differentiae: for the greater class is
predicated of the lesser, so that all the differentiae of the
predicate will be differentiae also of the subject.

4

Expressions which are in no way composite signify substance,
quantity, quality, relation, place, time, position, state, action,
or affection. To sketch my meaning roughly, examples of substance
are 'man' or 'the horse', of quantity, such terms as 'two cubits long'
or 'three cubits long', of quality, such attributes as 'white',
'grammatical'. 'Double', 'half', 'greater', fall under the category of
relation; 'in a the market place', 'in the Lyceum', under that of
place; 'yesterday', 'last year', under that of time. 'Lying',
'sitting', are terms indicating position, 'shod', 'armed', state;
'to lance', 'to cauterize', action; 'to be lanced', 'to be
cauterized', affection.

No one of these terms, in and by itself, involves an affirmation; it
is by the combination of such terms that positive or negative
statements arise. For every assertion must, as is admitted, be
either true or false, whereas expressions which are not in any way
composite such as 'man', 'white', 'runs', 'wins', cannot be either
true or false.

5

Substance, in the truest and primary and most definite sense of
the word, is that which is neither predicable of a subject nor present
in a subject; for instance, the individual man or horse. But in a
secondary sense those things are called substances within which, as
species, the primary substances are included; also those which, as
genera, include the species. For instance, the individual man is
included in the species 'man', and the genus to which the species
belongs is 'animal'; these, therefore-that is to say, the species
'man' and the genus 'animal,-are termed secondary substances.

It is plain from what has been said that both the name and the
definition of the predicate must be predicable of the subject. For
instance, 'man' is predicted of the individual man. Now in this case
the name of the species man' is applied to the individual, for we
use the term 'man' in describing the individual; and the definition of
'man' will also be predicated of the individual man, for the
individual man is both man and animal. Thus, both the name and the
definition of the species are predicable of the individual.

With regard, on the other hand, to those things which are present in
a subject, it is generally the case that neither their name nor
their definition is predicable of that in which they are present.
Though, however, the definition is never predicable, there is
nothing in certain cases to prevent the name being used. For instance,
'white' being present in a body is predicated of that in which it is
present, for a body is called white: the definition, however, of the
colour white' is never predicable of the body.

Everything except primary substances is either predicable of a
primary substance or present in a primary substance. This becomes
evident by reference to particular instances which occur. 'Animal'
is predicated of the species 'man', therefore of the individual man,
for if there were no individual man of whom it could be predicated, it
could not be predicated of the species 'man' at all. Again, colour
is present in body, therefore in individual bodies, for if there
were no individual body in which it was present, it could not be
present in body at all. Thus everything except primary substances is
either predicated of primary substances, or is present in them, and if
these last did not exist, it would be impossible for anything else
to exist.

Of secondary substances, the species is more truly substance than
the genus, being more nearly related to primary substance. For if
any one should render an account of what a primary substance is, he
would render a more instructive account, and one more proper to the
subject, by stating the species than by stating the genus. Thus, he
would give a more instructive account of an individual man by
stating that he was man than by stating that he was animal, for the
former description is peculiar to the individual in a greater
degree, while the latter is too general. Again, the man who gives an
account of the nature of an individual tree will give a more
instructive account by mentioning the species 'tree' than by
mentioning the genus 'plant'.

Moreover, primary substances are most properly called substances
in virtue of the fact that they are the entities which underlie every.
else, and that everything else is either predicated of them or present
in them. Now the same relation which subsists between primary
substance and everything else subsists also between the species and
the genus: for the species is to the genus as subject is to predicate,
since the genus is predicated of the species, whereas the species
cannot be predicated of the genus. Thus we have a second ground for
asserting that the species is more truly substance than the genus.

Of species themselves, except in the case of such as are genera,
no one is more truly substance than another. We should not give a more
appropriate account of the individual man by stating the species to
which he belonged, than we should of an individual horse by adopting
the same method of definition. In the same way, of primary substances,
no one is more truly substance than another; an individual man is
not more truly substance than an individual ox.

It is, then, with good reason that of all that remains, when we
exclude primary substances, we concede to species and genera alone the
name 'secondary substance', for these alone of all the predicates
convey a knowledge of primary substance. For it is by stating the
species or the genus that we appropriately define any individual
man; and we shall make our definition more exact by stating the former
than by stating the latter. All other things that we state, such as
that he is white, that he runs, and so on, are irrelevant to the
definition. Thus it is just that these alone, apart from primary
substances, should be called substances.

Further, primary substances are most properly so called, because
they underlie and are the subjects of everything else. Now the same
relation that subsists between primary substance and everything else
subsists also between the species and the genus to which the primary
substance belongs, on the one hand, and every attribute which is not
included within these, on the other. For these are the subjects of all
such. If we call an individual man 'skilled in grammar', the predicate
is applicable also to the species and to the genus to which he
belongs. This law holds good in all cases.

It is a common characteristic of all sub. stance that it is never
present in a subject. For primary substance is neither present in a
subject nor predicated of a subject; while, with regard to secondary
substances, it is clear from the following arguments (apart from
others) that they are not present in a subject. For 'man' is
predicated of the individual man, but is not present in any subject:
for manhood is not present in the individual man. In the same way,
'animal' is also predicated of the individual man, but is not
present in him. Again, when a thing is present in a subject, though
the name may quite well be applied to that in which it is present, the
definition cannot be applied. Yet of secondary substances, not only
the name, but also the definition, applies to the subject: we should
use both the definition of the species and that of the genus with
reference to the individual man. Thus substance cannot be present in a
subject.

Yet this is not peculiar to substance, for it is also the case
that differentiae cannot be present in subjects. The characteristics
'terrestrial' and 'two-footed' are predicated of the species 'man',
but not present in it. For they are not in man. Moreover, the
definition of the differentia may be predicated of that of which the
differentia itself is predicated. For instance, if the
characteristic 'terrestrial' is predicated of the species 'man', the
definition also of that characteristic may be used to form the
predicate of the species 'man': for 'man' is terrestrial.

The fact that the parts of substances appear to be present in the
whole, as in a subject, should not make us apprehensive lest we should
have to admit that such parts are not substances: for in explaining
the phrase 'being present in a subject', we stated' that we meant
'otherwise than as parts in a whole'.

It is the mark of substances and of differentiae that, in all
propositions of which they form the predicate, they are predicated
univocally. For all such propositions have for their subject either
the individual or the species. It is true that, inasmuch as primary
substance is not predicable of anything, it can never form the
predicate of any proposition. But of secondary substances, the species
is predicated of the individual, the genus both of the species and
of the individual. Similarly the differentiae are predicated of the
species and of the individuals. Moreover, the definition of the
species and that of the genus are applicable to the primary substance,
and that of the genus to the species. For all that is predicated of
the predicate will be predicated also of the subject. Similarly, the
definition of the differentiae will be applicable to the species and
to the individuals. But it was stated above that the word 'univocal'
was applied to those things which had both name and definition in
common. It is, therefore, established that in every proposition, of
which either substance or a differentia forms the predicate, these are
predicated univocally.

All substance appears to signify that which is individual. In the
case of primary substance this is indisputably true, for the thing
is a unit. In the case of secondary substances, when we speak, for
instance, of 'man' or 'animal', our form of speech gives the
impression that we are here also indicating that which is
individual, but the impression is not strictly true; for a secondary
substance is not an individual, but a class with a certain
qualification; for it is not one and single as a primary substance is;
the words 'man', 'animal', are predicable of more than one subject.

Yet species and genus do not merely indicate quality, like the
term 'white'; 'white' indicates quality and nothing further, but
species and genus determine the quality with reference to a substance:
they signify substance qualitatively differentiated. The determinate
qualification covers a larger field in the case of the genus that in
that of the species: he who uses the word 'animal' is herein using a
word of wider extension than he who uses the word 'man'.

Another mark of substance is that it has no contrary. What could
be the contrary of any primary substance, such as the individual man
or animal? It has none. Nor can the species or the genus have a
contrary. Yet this characteristic is not peculiar to substance, but is
true of many other things, such as quantity. There is nothing that
forms the contrary of 'two cubits long' or of 'three cubits long',
or of 'ten', or of any such term. A man may contend that 'much' is the
contrary of 'little', or 'great' of 'small', but of definite
quantitative terms no contrary exists.

Substance, again, does not appear to admit of variation of degree. I
do not mean by this that one substance cannot be more or less truly
substance than another, for it has already been stated' that this is
the case; but that no single substance admits of varying degrees
within itself. For instance, one particular substance, 'man', cannot
be more or less man either than himself at some other time or than
some other man. One man cannot be more man than another, as that which
is white may be more or less white than some other white object, or as
that which is beautiful may be more or less beautiful than some
other beautiful object. The same quality, moreover, is said to subsist
in a thing in varying degrees at different times. A body, being white,
is said to be whiter at one time than it was before, or, being warm,
is said to be warmer or less warm than at some other time. But
substance is not said to be more or less that which it is: a man is
not more truly a man at one time than he was before, nor is
anything, if it is substance, more or less what it is. Substance,
then, does not admit of variation of degree.

The most distinctive mark of substance appears to be that, while
remaining numerically one and the same, it is capable of admitting
contrary qualities. From among things other than substance, we
should find ourselves unable to bring forward any which possessed this
mark. Thus, one and the same colour cannot be white and black. Nor can
the same one action be good and bad: this law holds good with
everything that is not substance. But one and the selfsame
substance, while retaining its identity, is yet capable of admitting
contrary qualities.
The same individual person is at one time white,
at another black, at one time warm, at another cold, at one time good,
at another bad. This capacity is found nowhere else, though it might
be maintained that a statement or opinion was an exception to the
rule. The same statement, it is agreed, can be both true and false.
For if the statement 'he is sitting' is true, yet, when the person
in question has risen, the same statement will be false. The same
applies to opinions. For if any one thinks truly that a person is
sitting, yet, when that person has risen, this same opinion, if
still held, will be false. Yet although this exception may be allowed,
there is, nevertheless, a difference in the manner in which the
thing takes place. It is by themselves changing that substances
admit contrary qualities. It is thus that that which was hot becomes
cold, for it has entered into a different state. Similarly that
which was white becomes black, and that which was bad good, by a
process of change; and in the same way in all other cases it is by
changing that substances are capable of admitting contrary
qualities. But statements and opinions themselves remain unaltered
in all respects: it is by the alteration in the facts of the case that
the contrary quality comes to be theirs. The statement 'he is sitting'
remains unaltered, but it is at one time true, at another false,
according to circumstances. What has been said of statements applies
also to opinions. Thus, in respect of the manner in which the thing
takes place, it is the peculiar mark of substance that it should be
capable of admitting contrary qualities; for it is by itself
changing that it does so.

If, then, a man should make this exception and contend that
statements and opinions are capable of admitting contrary qualities,
his contention is unsound. For statements and opinions are said to
have this capacity, not because they themselves undergo
modification, but because this modification occurs in the case of
something else. The truth or falsity of a statement depends on
facts, and not on any power on the part of the statement itself of
admitting contrary qualities. In short, there is nothing which can
alter the nature of statements and opinions. As, then, no change takes
place in themselves, these cannot be said to be capable of admitting
contrary qualities.

But it is by reason of the modification which takes place within the
substance itself that a substance is said to be capable of admitting
contrary qualities; for a substance admits within itself either
disease or health, whiteness or blackness. It is in this sense that it
is said to be capable of admitting contrary qualities.

To sum up, it is a distinctive mark of substance, that, while
remaining numerically one and the same, it is capable of admitting
contrary qualities, the modification taking place through a change
in the substance itself.

Let these remarks suffice on the subject of substance.

6

Quantity is either discrete or continuous. Moreover, some quantities
are such that each part of the whole has a relative position to the
other parts: others have within them no such relation of part to part.

Instances of discrete quantities are number and speech; of
continuous, lines, surfaces, solids, and, besides these, time and
place.

In the case of the parts of a number, there is no common boundary at
which they join. For example: two fives make ten, but the two fives
have no common boundary, but are separate; the parts three and seven
also do not join at any boundary. Nor, to generalize, would it ever be
possible in the case of number that there should be a common
boundary among the parts; they are always separate. Number, therefore,
is a discrete quantity.

The same is true of speech. That speech is a quantity is evident:
for it is measured in long and short syllables. I mean here that
speech which is vocal. Moreover, it is a discrete quantity for its
parts have no common boundary. There is no common boundary at which
the syllables join, but each is separate and distinct from the rest.

A line, on the other hand, is a continuous quantity, for it is
possible to find a common boundary at which its parts join. In the
case of the line, this common boundary is the point; in the case of
the plane, it is the line: for the parts of the plane have also a
common boundary. Similarly you can find a common boundary in the
case of the parts of a solid, namely either a line or a plane.

Space and time also belong to this class of quantities. Time,
past, present, and future, forms a continuous whole. Space,
likewise, is a continuous quantity; for the parts of a solid occupy
a certain space, and these have a common boundary; it follows that the
parts of space also, which are occupied by the parts of the solid,
have the same common boundary as the parts of the solid. Thus, not
only time, but space also, is a continuous quantity, for its parts
have a common boundary.

Quantities consist either of parts which bear a relative position
each to each, or of parts which do not. The parts of a line bear a
relative position to each other, for each lies somewhere, and it would
be possible to distinguish each, and to state the position of each
on the plane and to explain to what sort of part among the rest each
was contiguous. Similarly the parts of a plane have position, for it
could similarly be stated what was the position of each and what
sort of parts were contiguous. The same is true with regard to the
solid and to space. But it would be impossible to show that the arts
of a number had a relative position each to each, or a particular
position, or to state what parts were contiguous. Nor could this be
done in the case of time, for none of the parts of time has an abiding
existence, and that which does not abide can hardly have position.
It would be better to say that such parts had a relative order, in
virtue of one being prior to another. Similarly with number: in
counting, 'one' is prior to 'two', and 'two' to 'three', and thus
the parts of number may be said to possess a relative order, though it
would be impossible to discover any distinct position for each. This
holds good also in the case of speech. None of its parts has an
abiding existence: when once a syllable is pronounced, it is not
possible to retain it, so that, naturally, as the parts do not
abide, they cannot have position. Thus, some quantities consist of
parts which have position, and some of those which have not.

Strictly speaking, only the things which I have mentioned belong
to the category of quantity: everything else that is called
quantitative is a quantity in a secondary sense. It is because we have
in mind some one of these quantities, properly so called, that we
apply quantitative terms to other things. We speak of what is white as
large, because the surface over which the white extends is large; we
speak of an action or a process as lengthy, because the time covered
is long; these things cannot in their own right claim the quantitative
epithet. For instance, should any one explain how long an action
was, his statement would be made in terms of the time taken, to the
effect that it lasted a year, or something of that sort. In the same
way, he would explain the size of a white object in terms of
surface, for he would state the area which it covered. Thus the things
already mentioned, and these alone, are in their intrinsic nature
quantities; nothing else can claim the name in its own right, but,
if at all, only in a secondary sense.

Quantities have no contraries. In the case of definite quantities
this is obvious; thus, there is nothing that is the contrary of 'two
cubits long' or of 'three cubits long', or of a surface, or of any
such quantities. A man might, indeed, argue that 'much' was the
contrary of 'little', and 'great' of 'small'. But these are not
quantitative, but relative; things are not great or small
absolutely, they are so called rather as the result of an act of
comparison. For instance, a mountain is called small, a grain large,
in virtue of the fact that the latter is greater than others of its
kind, the former less. Thus there is a reference here to an external
standard, for if the terms 'great' and 'small' were used absolutely, a
mountain would never be called small or a grain large. Again, we say
that there are many people in a village, and few in Athens, although
those in the city are many times as numerous as those in the
village: or we say that a house has many in it, and a theatre few,
though those in the theatre far outnumber those in the house. The
terms 'two cubits long, "three cubits long,' and so on indicate
quantity, the terms 'great' and 'small' indicate relation, for they
have reference to an external standard. It is, therefore, plain that
these are to be classed as relative.

Again, whether we define them as quantitative or not, they have no
contraries: for how can there be a contrary of an attribute which is
not to be apprehended in or by itself, but only by reference to
something external? Again, if 'great' and 'small' are contraries, it
will come about that the same subject can admit contrary qualities
at one and the same time, and that things will themselves be
contrary to themselves. For it happens at times that the same thing is
both small and great. For the same thing may be small in comparison
with one thing, and great in comparison with another, so that the same
thing comes to be both small and great at one and the same time, and
is of such a nature as to admit contrary qualities at one and the same
moment. Yet it was agreed, when substance was being discussed, that
nothing admits contrary qualities at one and the same moment. For
though substance is capable of admitting contrary qualities, yet no
one is at the same time both sick and healthy, nothing is at the
same time both white and black. Nor is there anything which is
qualified in contrary ways at one and the same time.

Moreover, if these were contraries, they would themselves be
contrary to themselves. For if 'great' is the contrary of 'small', and
the same thing is both great and small at the same time, then
'small' or 'great' is the contrary of itself. But this is
impossible. The term 'great', therefore, is not the contrary of the
term 'small', nor 'much' of 'little'. And even though a man should
call these terms not relative but quantitative, they would not have
contraries.

It is in the case of space that quantity most plausibly appears to
admit of a contrary. For men define the term 'above' as the contrary
of 'below', when it is the region at the centre they mean by
'below'; and this is so, because nothing is farther from the
extremities of the universe than the region at the centre. Indeed,
it seems that in defining contraries of every kind men have recourse
to a spatial metaphor, for they say that those things are contraries
which, within the same class, are separated by the greatest possible
distance.

Quantity does not, it appears, admit of variation of degree. One
thing cannot be two cubits long in a greater degree than another.
Similarly with regard to number: what is 'three' is not more truly
three than what is 'five' is five; nor is one set of three more
truly three than another set. Again, one period of time is not said to
be more truly time than another. Nor is there any other kind of
quantity, of all that have been mentioned, with regard to which
variation of degree can be predicated. The category of quantity,
therefore, does not admit of variation of degree.

The most distinctive mark of quantity is that equality and
inequality are predicated of it. Each of the aforesaid quantities is
said to be equal or unequal. For instance, one solid is said to be
equal or unequal to another; number, too, and time can have these
terms applied to them, indeed can all those kinds of quantity that
have been mentioned.

That which is not a quantity can by no means, it would seem, be
termed equal or unequal to anything else. One particular disposition
or one particular quality, such as whiteness, is by no means
compared with another in terms of equality and inequality but rather
in terms of similarity. Thus it is the distinctive mark of quantity
that it can be called equal and unequal.

7

Those things are called relative, which, being either said to be
of something else or related to something else, are explained by
reference to that other thing. For instance, the word 'superior' is
explained by reference to something else, for it is superiority over
something else that is meant. Similarly, the expression 'double' has
this external reference, for it is the double of something else that
is meant. So it is with everything else of this kind. There are,
moreover, other relatives, e. g. habit, disposition, perception,
knowledge, and attitude. The significance of all these is explained by
a reference to something else and in no other way. Thus, a habit is
a habit of something, knowledge is knowledge of something, attitude is
the attitude of something. So it is with all other relatives that have
been mentioned. Those terms, then, are called relative, the nature
of which is explained by reference to something else, the
preposition 'of' or some other preposition being used to indicate
the relation. Thus, one mountain is called great in comparison with
son with another; for the mountain claims this attribute by comparison
with something. Again, that which is called similar must be similar to
something else, and all other such attributes have this external
reference. It is to be noted that lying and standing and sitting are
particular attitudes, but attitude is itself a relative term. To
lie, to stand, to be seated, are not themselves attitudes, but take
their name from the aforesaid attitudes.

It is possible for relatives to have contraries. Thus virtue has a
contrary, vice, these both being relatives; knowledge, too, has a
contrary, ignorance. But this is not the mark of all relatives;
'double' and 'triple' have no contrary, nor indeed has any such term.

It also appears that relatives can admit of variation of degree. For
'like' and 'unlike', 'equal' and 'unequal', have the modifications
'more' and 'less' applied to them, and each of these is relative in
character: for the terms 'like' and 'unequal' bear 'unequal' bear a
reference to something external. Yet, again, it is not every
relative term that admits of variation of degree. No term such as
'double' admits of this modification. All relatives have correlatives:
by the term 'slave' we mean the slave of a master, by the term
'master', the master of a slave; by 'double', the double of its
hall; by 'half', the half of its double; by 'greater', greater than
that which is less; by 'less,' less than that which is greater.

So it is with every other relative term; but the case we use to
express the correlation differs in some instances. Thus, by
knowledge we mean knowledge the knowable; by the knowable, that
which is to be apprehended by knowledge; by perception, perception
of the perceptible; by the perceptible, that which is apprehended by
perception.

Sometimes, however, reciprocity of correlation does not appear to
exist. This comes about when a blunder is made, and that to which
the relative is related is not accurately stated. If a man states that
a wing is necessarily relative to a bird, the connexion between
these two will not be reciprocal, for it will not be possible to say
that a bird is a bird by reason of its wings. The reason is that the
original statement was inaccurate, for the wing is not said to be
relative to the bird qua bird, since many creatures besides birds have
wings, but qua winged creature. If, then, the statement is made
accurate, the connexion will be reciprocal, for we can speak of a
wing, having reference necessarily to a winged creature, and of a
winged creature as being such because of its wings.

Occasionally, perhaps, it is necessary to coin words, if no word
exists by which a correlation can adequately be explained. If we
define a rudder as necessarily having reference to a boat, our
definition will not be appropriate, for the rudder does not have
this reference to a boat qua boat, as there are boats which have no
rudders. Thus we cannot use the terms reciprocally, for the word
'boat' cannot be said to find its explanation in the word 'rudder'. As
there is no existing word, our definition would perhaps be more
accurate if we coined some word like 'ruddered' as the correlative
of 'rudder'. If we express ourselves thus accurately, at any rate
the terms are reciprocally connected, for the 'ruddered' thing is
'ruddered' in virtue of its rudder. So it is in all other cases. A
head will be more accurately defined as the correlative of that
which is 'headed', than as that of an animal, for the animal does
not have a head qua animal, since many animals have no head.

Thus we may perhaps most easily comprehend that to which a thing
is related, when a name does not exist, if, from that which has a
name, we derive a new name, and apply it to that with which the
first is reciprocally connected, as in the aforesaid instances, when
we derived the word 'winged' from 'wing' and from 'rudder'.

All relatives, then, if properly defined, have a correlative. I
add this condition because, if that to which they are related is
stated as haphazard and not accurately, the two are not found to be
interdependent. Let me state what I mean more clearly. Even in the
case of acknowledged correlatives, and where names exist for each,
there will be no interdependence if one of the two is denoted, not
by that name which expresses the correlative notion, but by one of
irrelevant significance. The term 'slave,' if defined as related,
not to a master, but to a man, or a biped, or anything of that sort,
is not reciprocally connected with that in relation to which it is
defined, for the statement is not exact. Further, if one thing is said
to be correlative with another, and the terminology used is correct,
then, though all irrelevant attributes should be removed, and only
that one attribute left in virtue of which it was correctly stated
to be correlative with that other, the stated correlation will still
exist. If the correlative of 'the slave' is said to be 'the master',
then, though all irrelevant attributes of the said 'master', such as
'biped', 'receptive of knowledge', 'human', should be removed, and the
attribute 'master' alone left, the stated correlation existing between
him and the slave will remain the same, for it is of a master that a
slave is said to be the slave. On the other hand, if, of two
correlatives, one is not correctly termed, then, when all other
attributes are removed and that alone is left in virtue of which it
was stated to be correlative, the stated correlation will be found
to have disappeared.

For suppose the correlative of 'the slave' should be said to be 'the
man', or the correlative of 'the wing"the bird'; if the attribute
'master' be withdrawn from' the man', the correlation between 'the
man' and 'the slave' will cease to exist, for if the man is not a
master, the slave is not a slave. Similarly, if the attribute 'winged'
be withdrawn from 'the bird', 'the wing' will no longer be relative;
for if the so-called correlative is not winged, it follows that 'the
wing' has no correlative.

Thus it is essential that the correlated terms should be exactly
designated; if there is a name existing, the statement will be easy;
if not, it is doubtless our duty to construct names. When the
terminology is thus correct, it is evident that all correlatives are
interdependent.

Correlatives are thought to come into existence simultaneously. This
is for the most part true, as in the case of the double and the
half. The existence of the half necessitates the existence of that
of which it is a half. Similarly the existence of a master
necessitates the existence of a slave, and that of a slave implies
that of a master; these are merely instances of a general rule.
Moreover, they cancel one another; for if there is no double it
follows that there is no half, and vice versa; this rule also
applies to all such correlatives. Yet it does not appear to be true in
all cases that correlatives come into existence simultaneously. The
object of knowledge would appear to exist before knowledge itself, for
it is usually the case that we acquire knowledge of objects already
existing; it would be difficult, if not impossible, to find a branch
of knowledge the beginning of the existence of which was
contemporaneous with that of its object.

Again, while the object of knowledge, if it ceases to exist, cancels
at the same time the knowledge which was its correlative, the converse
of this is not true. It is true that if the object of knowledge does
not exist there can be no knowledge: for there will no longer be
anything to know. Yet it is equally true that, if knowledge of a
certain object does not exist, the object may nevertheless quite
well exist. Thus, in the case of the squaring of the circle, if indeed
that process is an object of knowledge, though it itself exists as
an object of knowledge, yet the knowledge of it has not yet come
into existence. Again, if all animals ceased to exist, there would
be no knowledge, but there might yet be many objects of knowledge.

This is likewise the case with regard to perception: for the
object of perception is, it appears, prior to the act of perception.
If the perceptible is annihilated, perception also will cease to
exist; but the annihilation of perception does not cancel the
existence of the perceptible. For perception implies a body
perceived and a body in which perception takes place. Now if that
which is perceptible is annihilated, it follows that the body is
annihilated, for the body is a perceptible thing; and if the body does
not exist, it follows that perception also ceases to exist. Thus the
annihilation of the perceptible involves that of perception.

But the annihilation of perception does not involve that of the
perceptible. For if the animal is annihilated, it follows that
perception also is annihilated, but perceptibles such as body, heat,
sweetness, bitterness, and so on, will remain.

Again, perception is generated at the same time as the perceiving
subject, for it comes into existence at the same time as the animal.
But the perceptible surely exists before perception; for fire and
water and such elements, out of which the animal is itself composed,
exist before the animal is an animal at all, and before perception.
Thus it would seem that the perceptible exists before perception.

It may be questioned whether it is true that no substance is
relative, as seems to be the case, or whether exception is to be
made in the case of certain secondary substances. With regard to
primary substances, it is quite true that there is no such
possibility, for neither wholes nor parts of primary substances are
relative. The individual man or ox is not defined with reference to
something external. Similarly with the parts: a particular hand or
head is not defined as a particular hand or head of a particular
person, but as the hand or head of a particular person. It is true
also, for the most part at least, in the case of secondary substances;
the species 'man' and the species 'ox' are not defined with
reference to anything outside themselves. Wood, again, is only
relative in so far as it is some one's property, not in so far as it
is wood. It is plain, then, that in the cases mentioned substance is
not relative. But with regard to some secondary substances there is
a difference of opinion; thus, such terms as 'head' and 'hand' are
defined with reference to that of which the things indicated are a
part, and so it comes about that these appear to have a relative
character. Indeed, if our definition of that which is relative was
complete, it is very difficult, if not impossible, to prove that no
substance is relative. If, however, our definition was not complete,
if those things only are properly called relative in the case of which
relation to an external object is a necessary condition of
existence, perhaps some explanation of the dilemma may be found.

The former definition does indeed apply to all relatives, but the
fact that a thing is explained with reference to something else does
not make it essentially relative.

From this it is plain that, if a man definitely apprehends a
relative thing, he will also definitely apprehend that to which it
is relative. Indeed this is self-evident: for if a man knows that some
particular thing is relative, assuming that we call that a relative in
the case of which relation to something is a necessary condition of
existence, he knows that also to which it is related. For if he does
not know at all that to which it is related, he will not know
whether or not it is relative. This is clear, moreover, in
particular instances. If a man knows definitely that such and such a
thing is 'double', he will also forthwith know definitely that of
which it is the double. For if there is nothing definite of which he
knows it to be the double, he does not know at all that it is
double. Again, if he knows that a thing is more beautiful, it
follows necessarily that he will forthwith definitely know that also
than which it is more beautiful. He will not merely know
indefinitely that it is more beautiful than something which is less
beautiful, for this would be supposition, not knowledge. For if he
does not know definitely that than which it is more beautiful, he
can no longer claim to know definitely that it is more beautiful
than something else which is less beautiful: for it might be that
nothing was less beautiful. It is, therefore, evident that if a man
apprehends some relative thing definitely, he necessarily knows that
also definitely to which it is related.

Now the head, the hand, and such things are substances, and it is
possible to know their essential character definitely, but it does not
necessarily follow that we should know that to which they are related.
It is not possible to know forthwith whose head or hand is meant. Thus
these are not relatives, and, this being the case, it would be true to
say that no substance is relative in character. It is perhaps a
difficult matter, in such cases, to make a positive statement
without more exhaustive examination, but to have raised questions with
regard to details is not without advantage.

8

By 'quality' I mean that in virtue of which people are said to be
such and such.

Quality is a term that is used in many senses. One sort of quality
let us call 'habit' or 'disposition'. Habit differs from disposition
in being more lasting and more firmly established. The various kinds
of knowledge and of virtue are habits, for knowledge, even when
acquired only in a moderate degree, is, it is agreed, abiding in its
character and difficult to displace, unless some great mental upheaval
takes place, through disease or any such cause. The virtues, also,
such as justice, self-restraint, and so on, are not easily dislodged
or dismissed, so as to give place to vice.

By a disposition, on the other hand, we mean a condition that is
easily changed and quickly gives place to its opposite. Thus, heat,
cold, disease, health, and so on are dispositions. For a man is
disposed in one way or another with reference to these, but quickly
changes, becoming cold instead of warm, ill instead of well.