For when menstruation occurs in this way, it indicates that the womb is in a proper condition and is performing its function, and also, because the neck is not immediately distended but becomes soft, that it relaxes at the same time as the rest of the body, and does not impede but first expels the fluid from the neck itself; but when the body emits a greater amount, it is distended and that is a mark of a healthy condition of the neck.