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. It is this
difference in thickness which makes the milk of horned animals
coagulate, while that of animals without horns does not. Rennet
forms in the hare because it feeds on herbage that has juice like that
of the fig; for juice of this kind coagulates the milk in the
stomach of the sucklings. Why it is in the manyplies that rennet is
formed in animals with multiple stomachs has been stated in the
Problems.
Book IV
1
THE account which has now been given of the viscera, the stomach,
and the other several parts holds equally good not only for the
oviparous quadrupeds, but also for such apodous animals as the
Serpents. These two classes of animals are indeed nearly akin, a
serpent resembling a lizard which has been lengthened out and deprived
of its feet. Fishes, again, resemble these two groups in all their
parts, excepting that, while these, being land animals, have a lung,
fishes have no lung, but gills in its place. None of these animals,
excepting the tortoise, as also no fish, has a urinary bladder. For
owing to the bloodlessness of their lung, they drink but sparingly;
and such fluid as they have is diverted to the scaly plates, as in
birds it is diverted to the feathers, and thus they come to have the
same white matter on the surface of their excrement as we see on
that of birds. For in animals that have a bladder, its excretion
when voided throws down a deposit of earthy brine in the containing
vessel
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