With regard to organs of defence and offence, such
as teeth, tusks, horns, spurs, and the like, these in some species the
male possesses and the female does not; as, for instance, the hind has
no horns, and where the cock-bird has a spur the hen is entirely
destitute of the organ; and in like manner the sow is devoid of tusks.
In other species such organs are found in both sexes, but are more
perfectly developed in the male; as, for instance, the horn of the
bull is more powerful than the horn of the cow.
Book V
1
As to the parts internal and external that all animals are
furnished withal, and further as to the senses, to voice, and sleep,
and the duality sex, all these topics have now been touched upon. It
now remains for us to discuss, duly and in order, their several
modes of propagation.
These modes are many and diverse, and in some respects are like,
and in other respects are unlike to one another. As we carried on
our previous discussion genus by genus, so we must attempt to follow
the same divisions in our present argument; only that whereas in the
former case we started with a consideration of the parts of man, in
the present case it behoves us to treat of man last of all because
he involves most discussion.
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