again acquire it, (Exercit. de Gener. Anim. 48). The same observation is
made by Hippocrates.

A little further experience teaches the young animal to suck by absorption,
as well as by compression; that is, to open the chest as in the beginning
of respiration, and thus to rarefy the air in the mouth, that the pressure
of the denser external atmosphere may contribute to force out the milk.

The chick yet in the shell has learnt to drink by swallowing a part of the
white of the egg for its food; but not having experienced how to take up
and swallow solid seeds, or grains, is either taught by the felicitous
industry of its mother; or by many repeated attempts is enabled at length
to distinguish and to swallow this kind of nutriment.

And puppies, though they know how to suck like other animals from their
previous experience in swallowing, and in respiration; yet are they long in
acquiring the art of lapping with their tongues, which from the flaccidity
of their cheeks, and length of their mouths, is afterwards a more
convenient way for them to take in water.

V. The senses of smell and taste in many other animals greatly excel those
of mankind, for in civilized society, as our victuals are generally
prepared by others, and are adulterated with salt, spice, oil, and
empyreuma, we do not hesitate about eating whatever is set before us, and
neglect to cultivate these senses: whereas other animals try every morsel
by the smell, before they take it into their mouths, and by the taste
before they swallow it: and are led not only each to his proper nourishment
by this organ of sense, but it also at a maturer age directs them in the
gratification of their appetite of love. Which may be further understood by
considering the sympathies of these parts described in Class IV. 2. 1. 7.