62 BEN NET M. ALLEN. 



few sex cells, which are more numerous in the regions nearest to 

 the ovary. There is a definite interaction between the capsules 

 of Bowman and the rete-cords lying nearest to them. Each 

 sends forth a process to meet the other. In the testis the rete 

 cords send out processes (tubuli recti) to meet the seminiferous 

 tubules at their inner ends. Each tubule receives its rete branch. 

 A large number of tubuli recti can arise, from a single rete-tub- 

 ule at different points in its course. The connection between 

 cell degeneration and the formation of interstitial cells has already 

 been discussed. The uriniferous tubules of those glomeruli with 

 which the rete-cords come in contact persist as the rete efferentia 

 of the male, while the remaining ones disappear wholly, or in 

 large part at least. A few rudiments of these rete efferentia 

 tubules persist in contact with the rete ovarii. Such rudiments 

 are very rare in the pig embryo of 25 cm. length. 



HULL ZOOLOGICAL LABORATORY, 



UNIVERSITY OF CHICAGO, April 20, 1903. 



