[132] This is one reason; and we must also mention another, which is aimed at the truth like an arrow at a mark. It is not the nature of anything upon the earth to exist without a moist essence. And this is indicated by the throwing of seed, which is either moist, as the seed of animals, or else does not shoot up without moisture, such as the seeds of plants; from which it is evident that it follows that the aforesaid moist essence must be a portion of the earth which produces everything, just as the flux of the catamenia is a part of women. For by men who are learned in natural philosophy, this also is said to be the corporeal essence of children.