GENERATION OF ANIMALS, I. xx. 



in their formation, as, e.g., the mule," the evacuation 

 is not as ob^■ious as it is in human beings. An exact 

 account of this matter, as it concerns every sort of 

 animal, is to be found in the Researches upon Animals.^ 

 A larger amount of evacuation is produced by women 

 than by any other animal, and a larger amount of 

 semen in proportion to their size is emitted by men ; 

 the reason being that the composition of the human 

 body is fluid and warm, and that is just the sort of 

 organism which of necessity produces the greatest 

 amount of residue ; further, the human body does 

 not possess the sort of parts to which the residue gets 

 diverted, as other animals do : it has no great coat 

 of hair all over the body,*^ and no secretions in the 

 form of bones, horns and tusks. 



Here is an indication that the semen resides in the 

 menstrual discharge. As I said before, this residue 

 is formed in males at the same time of Ufe as the 

 menstrual discharge becomes noticeable in females ; 

 which suggests that the places which are the recep- 

 tacles of these residues also become differentiated at 

 the same time in each sex ; and as the neighbouring 

 ])laces in each sex become less firm in their con- 

 sistency, the pubic hair grows up too. Just before 

 these places receive their differentiation, they are 

 swelled up by the pneuma : in males, this is clearer 

 in regard to the testes, but it is also to be noticed in 

 the breasts ; whereas in females it is clearer in the 

 breasts : it is when the breasts have risen a couple 

 of fingers' breadth that the menstrual discharge 

 begins in most women. 



Now in those li\-ing creatures where male and 

 female are not separate, the semen (seed) is as it 



' Or, in proportion to the size of the body. 



107 



