[123] It is affirmed also that the secretions of the body are performed in the aforesaid number of seven. For tears are poured out through the eyes, and the purifications of the head through the nostrils, and through the mouth the saliva which is spit out; there are, besides two other channels for the evacuation of the superfluities of the body, the one being placed in front and the the other behind; the sixth mode of evacuation is the effusion of perspiration over the whole body, and the seventh that most natural exercise of the generative powers.