In certain cases we find a double set of generative organs [one
male and the other female]. When such duplication occurs the one is
always functional but not the other, because it is always
insufficiently supplied with nourishment as being contrary to
Nature; it is attached like a growth (for such growths also receive
nourishment though they are a later development than the body proper
and contrary to Nature.) If the formative power prevails, both are
similar; if it is altogether vanquished, both are similar; but if it
prevail here and be vanquished there, then the one is female and the
other male. (For whether we consider the reason why the whole
animal is male or female, or why the parts are so, makes no
difference.)
When we meet with deficiency in such parts, e.g. an extremity or one
of the other members, we must assume the same cause as when the embryo
is altogether aborted (abortion of embryos happens frequently).
Outgrowths differ from the production of many young in the manner
stated before; monsters differ from these in that most of them are due
to embryos growing together. Some however are also of the following
kind, when the monstrosity affects greater and more sovereign parts,
as for instance some monsters have two spleens or more than two
kidneys. Further, the parts may migrate, the movements which form
the embryo being diverted and the material changing its place.
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