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Aristotle

"On The Generation Of Animals"

As the embryo is
perfecting, the residual matter left over increases in quantity
because the part consumed by the embryo is less; it is also sweeter
since the easily concocted part is less drawn away from it. For it
is no longer expended on moulding the embryo but only on slightly
increasing its growth, it being now fixed because it has reached
perfection (for in a sense there is a perfection even of an embryo).
Therefore it comes forth from the mother and changes its mode of
development, as now possessing what belongs to it; and no longer takes
that which does not belong to it; and it is at this season that the
milk becomes useful.
The milk collects in the upper part of the body and the breasts
because of the original plan of the organism. For the part above the
hypozoma is the sovereign part of the animal, while that below is
concerned with nourishment and residual matter, in order that all
animals which move about may contain within themselves nourishment
enough to make them independent when they move from one place to
another. From this upper part also is produced the generative
secretion for the reason mentioned in the opening of our discussion.
But both the secretion of the male and the catamenia of the female are
of a sanguineous nature, and the first principle of this blood and
of the blood-vessels is the heart, and the heart is in this part of
the body. Therefore it is here that the change of such a secretion
must first become plain.


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