As for the senses and for the organs of sensation, the eyes,
the nostrils, and the tongue, all alike are situated frontwards; the
sense of hearing, and the organ of hearing, the ear, is situated
sideways, on the same horizontal plane with the eyes. The eyes in
man are, in proportion to his size, nearer to one another than in
any other animal.
Of the senses man has the sense of touch more refined than any
animal, and so also, but in less degree, the sense of taste; in the
development of the other senses he is surpassed by a great number of
animals.
16
The parts, then, that are externally visible are arranged in the
way above stated, and as a rule have their special designations, and
from use and wont are known familiarly to all; but this is not the
case with the inner parts. For the fact is that the inner parts of man
are to a very great extent unknown, and the consequence is that we
must have recourse to an examination of the inner parts of other
animals whose nature in any way resembles that of man.
In the first place then, the brain lies in the front part of the
head. And this holds alike with all animals possessed of a brain;
and all blooded animals are possessed thereof, and, by the way,
molluscs as well.
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