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. Continuous with this stomach
is what is called the gut. These parts are present in all animals, for
reasons that are self-evident. For it is a matter of necessity that an
animal shall receive the incoming food; and necessary also that it
shall discharge the same when its goodness is exhausted. This residual
matter, again, must not occupy the same place as the yet unconcocted
nutriment. For as the ingress of food and the discharge of the residue
occur at distinct periods, so also must they necessarily occur in
distinct places. Thus there must be one receptacle for the ingoing
food and another for the useless residue, and between these,
therefore, a part in which the change from one condition to the
other may be effected. These, however, are matters which will be
more suitably set forth when we come to deal with Generation and
Nutrition. What we have at present to consider are the variations
presented by the stomach and its subsidiary parts. For neither in size
nor in shape are these parts uniformly alike in all animals. Thus
the stomach is single in all such sanguineous and viviparous animals
as have teeth in front of both jaws. It is single therefore in all the
polydactylous kinds, such as man, dog, lion, and the rest; in all
the solid-hoofed animals also, such as horse, mule, ass; and in all
those which, like the pig, though their hoof is cloven, yet have front
teeth in both jaws
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