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. Thus much then concerning the mammae.
Next after the breast comes the region of the belly, which is left
unenclosed by the ribs for a reason which has already been given;
namely that there may be no impediment to the swelling which
necessarily occurs in the food as it gets heated, nor to the expansion
of the womb in pregnancy.
At the extreme end of what is called the trunk are the parts
concerned in the evacuation of the solid and also of the fluid
residue. In all sanguineous animals with some few exceptions, and in
all Vivipara without any exception at all, the same part which
serves for the evacuation of the fluid residue is also made by
nature to serve in sexual congress, and this alike in male and female.
For the semen is a kind of fluid and residual matter. The proof of
this will be given hereafter, but for the present let it taken for
granted. (The like holds good of the menstrual fluid in women, and
of the part where they emit semen. This also, however, is a matter
of which a more accurate account will be given hereafter. For the
present let it be simply stated as a fact, that the catamenia of the
female like the semen of the male are residual matter. Both of them,
moreover, being fluid, it is only natural that the parts which serve
for voidance of the urine should give issue to residues which resemble
it in character.) Of the internal structure of these parts, and of the
differences which exist between the parts concerned with semen and the
parts concerned with conception, a clear account is given in the
book of Researches concerning Animals and in the treatises on Anatomy
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