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. Nor is this without a rational explanation. For what is
called the empty space is full of air, and the organ of hearing is, as
we say, of the nature of air. Now there are channels which lead from
the eyes to the blood-vessels that surround the brain; and similarly
there is a channel which leads back again from each ear and connects
it with the hinder part of the head. But no part that is without blood
is endowed with sensation, as neither is the blood itself, but only
some one of the parts that are formed of blood.
The brain in all animals that have one is placed in the front part
of the head; because the direction in which sensation acts is in
front; and because the heart, from which sensation proceeds, is in the
front part of the body; and lastly because the instruments of
sensation are the blood-containing parts, and the cavity in the
posterior part of the skull is destitute of blood-vessels.
As to the position of the sense-organs, they have been arranged by
nature in the following well-ordered manner. The organs of hearing are
so placed as to divide the circumference of the head into two equal
halves; for they have to hear not only sounds which are directly in
line with themselves, but sounds from all quarters. The organs of
vision are placed in front, because sight is exercised only in a
straight line, and moving as we do in a forward direction it is
necessary that we should see before us, in the direction of our
motion
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