Chapter VI.

How it is that Conceptions are Made.

Aristotle says, that conception takes place when the womb is drawn down by the natural purgation, and the monthly terms attract from the whole mass part of the purest blood, and this is met by the seed of man. On the contrary, there is a failure by the impurity and inflation of the womb, by fear and grief, by the weakness of women, or the decline of strength in men.