Now since (1) the one sex is able and
the other is unable to reduce the residual secretion to a pure form,
and (2) every capacity or power in an organism has a certain
corresponding organ, whether the faculty produces the desired
results in a lower degree or in a higher degree, and the two sexes
correspond in this manner (the terms 'able' and 'unable' being used
in more senses than one)- therefore it is necessary that both female
and male should have organs. Accordingly the one has the uterus, the
other the male organs.
Again, Nature gives both the faculty and the organ to each
individual at the same time, for it is better so. Hence each region
comes into being along with the secretions and the faculties, as
e.g. the faculty of sight is not perfected without the eye, nor the
eye without the faculty of sight; and so too the intestine and bladder
come into being along with the faculty of forming the excreta. And
since that from which an organ comes into being and that by which it
is increased are the same (i.e. the nutriment), each of the parts
will be made out of such a material and such residual matter as it
is able to receive. In the second place, again, it is formed, as we
say, in a certain sense, out of its opposite. Thirdly, we must
understand besides this that, if it is true that when a thing perishes
it becomes the opposite of what it was, it is necessary also that what
is not under the sway of that which made it must change into its
opposite.
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