That the womb should have such a character is clear from the following considerations: if it does not come close enough, it will not be capable of drawing matter up (for the place from which it must receive the matter will be distant from it); but if it remains close and is not capable of receding further away, it will be less responsive because of being continually touched, so that it will not open quickly something which it must do vigorously and with prompt obedience.