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. Amongst those that appear only at
a later period are the residua of the food, which include the deposits
of the belly and also those of the bladder. Besides these there is the
semen and the milk, one or the other of which makes its appearance
in appropriate animals. Of these fluids the excremental residua of the
food may be suitably discussed by themselves, when we come to
examine and consider the subject of nutrition. Then will be the time
to explain in what animals they are found, and what are the reasons
for their presence. Similarly all questions concerning the semen and
the milk may be dealt with in the treatise on Generation, for the
former of these fluids is the very starting-point of the generative
process, and the latter has no other ground of existence than
generative purposes.
8
We have now to consider the remaining homogeneous parts, and will
begin with flesh, and with the substance that, in animals that have no
flesh, takes its place. The reason for so beginning is that flesh
forms the very basis of animals, and is the essential constituent of
their body. Its right to this precedence can also be demonstrated
logically. For an animal is by our definition something that has
sensibility and chief of all the primary sensibility, which is that of
Touch; and it is the flesh, or analogous substance, which is the organ
of this sense. And it is the organ, either in the same way as the
pupil is the organ of sight, that is it constitutes the primary
organ of the sense; or it is the organ and the medium through which
the object acts combined, that is it answers to the pupil with the
whole transparent medium attached to it
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