There is no external sign of the existence of these organs in
the mole, owing to the thickness of the skin drawn over them, so
that it would seem that the natural course of development were
congenitally arrested; (for extending from the brain at its junction
with the marrow are two strong sinewy ducts running past the sockets
of the eyes, and terminating at the upper eye-teeth). All the other
animals of the kinds above mentioned have a perception of colour and
of sound, and the senses of smell and taste; the fifth sense, that,
namely, of touch, is common to all animals whatsoever.
In some animals the organs of sense are plainly discernible; and
this is especially the case with the eyes. For animals have a
special locality for the eyes, and also a special locality for
hearing: that is to say, some animals have ears, while others have the
passage for sound discernible. It is the same with the sense of smell;
that is to say, some animals have nostrils, and others have only the
passages for smell, such as birds. It is the same also with the
organ of taste, the tongue. Of aquatic red-blooded animals, fishes
possess the organ of taste, namely the tongue, but it is in an
imperfect and amorphous form, in other words it is osseous and
undetached.
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