So much then for the parts, external and internal, exceptional and
common, of all animals.
8
We now proceed to treat of the senses; for there are diversities
in animals with regard to the senses, seeing that some animals have
the use of all the senses, and others the use of a limited number of
them. The total number of the senses (for we have no experience of any
special sense not here included), is five: sight, hearing, smell,
taste, and touch.
Man, then, and all vivipara that have feet, and, further, all
red-blooded ovipara, appear to have the use of all the five senses,
except where some isolated species has been subjected to mutilation,
as in the case of the mole. For this animal is deprived of sight; it
has no eyes visible, but if the skin-a thick one, by the way-be
stripped off the head, about the place in the exterior where eyes
usually are, the eyes are found inside in a stunted condition,
furnished with all the parts found in ordinary eyes; that is to say,
we find there the black rim, and the fatty part surrounding it; but
all these parts are smaller than the same parts in ordinary visible
eyes.
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