These parts are blood and vein, and in other animals
there is something to correspond; but in these latter the parts are
imperfect, being merely fibre and serum or lymph.
Touch has its seat in a part uniform and homogeneous, as in the
flesh or something of the kind, and generally, with animals supplied
with blood, in the parts charged with blood. In other animals it has
its seat in parts analogous to the parts charged with blood; but in
all cases it is seated in parts that in their texture are homogeneous.
The active faculties, on the contrary, are seated in the parts
that are heterogeneous: as, for instance, the business of preparing
the food is seated in the mouth, and the office of locomotion in the
feet, the wings, or in organs to correspond.
Again, some animals are supplied with blood, as man, the horse,
and all such animals as are, when full-grown, either destitute of
feet, or two-footed, or four-footed; other animals are bloodless, such
as the bee and the wasp, and, of marine animals, the cuttle-fish,
the crawfish, and all such animals as have more than four feet.
5
Again, some animals are viviparous, others oviparous, others
vermiparous or 'grub-bearing'.
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