their nativity: which however puppies do not, (Swammerden, p. 319. Flemyng
Phil. Trans. Ann. 1755. 42). And towards the end of gestation, the foetus
of all animals are proved to drink part of the liquid in which they swim,
(Haller. Physiol. T. 8. 204). The white of egg is found in the mouth and
gizzard of the chick, and is nearly or quite consumed before it is hatched,
(Harvie de Generat. 58). And the liquor amnii is found in the mouth and
stomach of the human foetus, and of calves; and how else should that
excrement be produced in the intestines of all animals, which is voided in
great quantity soon after their birth; (Gipson, Med. Essays, Edinb. V. i.
13. Halleri Physiolog. T. 3. p. 318. and T. 8). In the stomach of a calf
the quantity of this liquid amounted to about three pints, and the hairs
amongst it were of the same colour with those on its skin, (Blasii Anat.
Animal, p.m. 122). These facts are attested by many other writers of
credit, besides those above mentioned.

III. It has been deemed a surprising instance of instinct, that calves and
chickens should be able to walk by a few efforts almost immediately after
their nativity: whilst the human infant in those countries where he is not
incumbered with clothes, as in India, is five or six months, and in our
climate almost a twelvemonth, before he can safely stand upon his feet.

The struggles of all animals in the womb must resemble their mode of
swimming, as by this kind of motion they can best change their attitude in
water. But the swimming of the calf and chicken resembles their manner of
walking, which they have thus in part acquired before their nativity, and
hence accomplish it afterwards with very few efforts, whilst the swimming
of the human creature resembles that of the frog, and totally differs from
his mode of walking.

There is another circumstance to be attended to in this affair, that not