And, by the way, I may here remark that the organ receptive
of wet residuum is termed 'bladder', and the organ receptive of dry
residuum 'intestine or 'bowel'.
3
Of animals otherwise, a great many have, besides the organs
above-mentioned, an organ for excretion of the sperm: and of animals
capable of generation one secretes into another, and the other into
itself. The latter is termed 'female', and the former 'male'; but some
animals have neither male nor female. Consequently, the organs
connected with this function differ in form, for some animals have a
womb and others an organ analogous thereto.
The above-mentioned organs, then, are the most indispensable parts
of animals; and with some of them all animals without exception, and
with others animals for the most part, must needs be provided.
One sense, and one alone, is common to all animals-the sense of
touch. Consequently, there is no special name for the organ in which
it has its seat; for in some groups of animals the organ is identical,
in others it is only analogous.
4
Every animal is supplied with moisture, and, if the animal be
deprived of the same by natural causes or artificial means, death
ensues: further, every animal has another part in which the moisture
is contained.
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