This is why the voice changes in both sexes
when they begin to bear seed (for the first principle of the voice
resides there, and is itself changed when its moving cause changes).
At the same time the parts about the breasts are raised visibly
even in males but still more in females, for the region of the breasts
becomes empty and spongy in them because so much material is drained
away below. This is so not only in women but also in those animals
which have the mammae low down.
This change in the voice and the parts about the mammae is plain
even in other creatures to those who have experience of each kind of
animal, but is most remarkable in man. The reason is that in man the
production of secretion is greatest in both sexes in proportion to
their size as compared with other animals; I mean that of the
catamenia in women and the emission of semen in men. When,
therefore, the embryo no longer takes up the secretion in question but
yet prevents its being discharged from the mother, it is necessary
that the residual matter should collect in all those empty parts which
are set upon the same passages. And such is the position of the mammae
in each kind of animals for both causes; it is so both for the sake of
what is best and of necessity.
It is here, then, that the nourishment in animals is now formed
and becomes thoroughly concocted. As for the cause of concoction, we
may take that already given, or we may take the opposite, for it is
a reasonable view also that the embryo being larger takes more
nourishment, so that less is left over about this time, and the less
is concocted more quickly.
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