HOW IT IS THAT CONCEPTIONS ARE MADE.
ARISTOTLE says, that conception takes place when the
womb is drawn forward by the natural purgation, and
the monthly terms attract from the whole bulk part of the
purest blood, and this is met by the genital seed of man.
On the contrary, there is a failure by the impurity and
inflation of the womb, by the passions of fear and grief, by
the weakness of women, or the decay of strength in men.