No More Learning

" I must premise that about 170 or 180
drops had been my ordinary allowance for many months; occasionally I had
run up as high as 500, and once nearly to 700; in repeated           to my
final experiment I had also gone as low as 100 drops; but had found it
impossible to stand it beyond the fourth day--which, by the way, I have
always found more difficult to get over than any of the preceding three.