HISTORICAL IMPORTANCE OF THE SEXUAL ORGANS. 427 



FIG. 830. Development of human ovules within the female ovary. A. 

 Vertical section through the ovary of a new-born female : a, epithelium of 

 the ovary ; b, rudiment of an egg-cord ; c, young eggs in the epithelium ; 

 d, longer egg-cord with the follicles ; e, group of young follicles ; /, single 

 young follicle; g, blood-vessels in the connective tissue (stroma) of the 

 ovary. In the cords the young primitive eggs can be distinguished from 

 the surrounding cells of the follicle by their relatively large size. (After 

 VValdeyer). 330, B. Two young follicles isolated ; in 1, the cells of the 

 follicle form but a single layer around the young primitive egg ; in 2, they 

 form a double layer j in 2, they begin to form the primary chorion (a), or 

 the zona pellucida (vol. i. p. 135). 330, C. A mature human Graafian follicle : 

 a, the mature egg ; 6, the surrounding follicle-cells ; c, the epithelial cells of 

 the follicle; d, the fibrous membrane of the follicle; e, its outer surface. 



The entire natural history of the human sexual organs 

 is one of the branches of Anthropology which affords the 

 strongest proofs of the origin of the human race from the 

 animal kingdom. Each man, on knowing the pertinent 

 facts, and without prejudice, judging these comparatively, 

 can but be convinced that he is descended from lower 

 Vertebrates. The general, and the more minute structure, 

 the activity and the individual evolution of the sexual 

 organs, is exactly the same in Man as in Apes. This is as 

 true of the male as of the female, of the internal as of the 

 external genitalia. The differences in this matter between 

 Man and the most man-like Apes are far less than the 

 differences between the various forms of Apes. As, how- 

 ever, all Apes are undoubtedly from a common origin, this 

 fact alone proves, with absolute certainty, the descent of 

 Man from Apes. 



