ON GENERATION. 473 



and excrements to inferior portions of the gut, as if they were 

 surrounded and compressed with a ring forced over them, or 

 were stripped between the fingers. 



The uterine veins, as in woman, all arise from .the vena 

 cava, near the emulgents; the arteries (and this also is common 

 to the deer and the human subject) arise from the crural 

 branches of the descending aorta. And as in the pregnant 

 woman the uterine vessels are relatively larger and more nu- 

 merous than in any other part of the body, this is likewise 

 the case in the pregnant hind and doe. The arteries, how- 

 ever, contrary to the arrangement in other parts of the body, 

 are much more numerous than the veins ; and air blown into 

 them makes its way into the neighbouring veins, although the 

 arteries cannot be inflated in their turn by blowing into the 

 veins. This fact I also find mentioned by Master Riolanus ; and 

 it is a cogent argument for the circulation of the blood disco- 

 vered by me ; for he clearly proves that whilst there is a pas- 

 sage from the arteries into the veins, there is none backwards 

 from the veins into the arteries. The arteries are more nume- 

 rous than the veins, because a large supply of nourishment 

 being required for the foetus, it is only what is left unused that 

 has to be returned by the latter channels. 



In the deer as well as in the sheep, goat, and bisulcate ani- 

 mals generally, we find testicles; but these are mere little 

 glands, which rather correspond in their proportions to the 

 prostate or mesenteric glands, the use of which is to establish 

 divarications for the veins, and to store up a fluid for lubricat- 

 ing the parts, than for secreting semen, concocting it into 

 fecundity, and shedding it at the time of intercourse. I am 

 myself especially moved to adopt this opinion, as well by nu- 

 merous reasons which will be adduced elsewhere, as by the fact 

 that in the rutting season, when the testes of the buck and 

 hart enlarge and are replete with semen, and the cornua of the 

 uterus of the hind and doe are greatly changed, the female 

 testicles, as they are called, whether they be examined before 

 or after intercourse, neither swell nor vary from their usual 

 condition; they show no trace of being of the slightest use 

 either in the business of intercourse or in that of generation. 



It is surprising what a quantity of seminal fluid is found 

 in the vesiculae seminales and testicles of moles and the larger 



