560 F. A. E. CREW AND HONOR B. FELL 



aro well marked and the large oval nuclei show no indication 

 of degeneration. 



Intertubular Tissue. — Large quantities of inter- 

 tubular tissue are present, the connective tissue being consider- 

 ably in excess of the interstitial. The connective tissue appears 

 normal. The interstitial cells have an oval nucleus showing 

 a granular structure and very clear cytoplasm the periphery 

 of which is difficult to make out. In many cases the cells 

 appear as mere naked nuclei, some of which stain more 

 densely than others. It would seem that the interstitial 

 cells are either normal or in a very early stage of de- 

 generation. 



Tunica Albuginea. — The testis is invested by the usual 

 fibrous capsule or tunica albuginea, the histology of which is 

 normal. The only point of interest with reference to this 

 structure is the presence in places of a layer of adipose tissue, 

 some three cells deep, which splits the tunica albuginea into 

 a peripheral and a central layer. 



Vasa Ef ferentia. — These, Hke the rete testis, show no 

 sign of degeneration. They are lined by normal columnar 

 ciliated epithelial cells, the large oval nuclei of which show 

 a somewhat reticulate structure. The bunches of cilia appear 

 as protoplasmic tags extending into the lumen. 



Epididymis . — The structure of the epididymis is in every 

 way typical. It is composed of a layer of ciliated columnar 

 epithelium resting on a basal layer. The basal cells contain 

 large oval nuclei whose long axes are set transversely to the 

 radius of the tube. Cross-sections of the epididymis differ 

 from those of the vasa differentia in the presence of the basal 

 layer, the relatively larger nuclei, and greater thickness of 

 the columnar epithelium. 



Blood-vessels. — Closely associated with the gonad in 

 the region of the epididymis is a considerable venous plexus, 

 the interstices of which are largely filled with adipose tissue. 

 The substance of the gonad is richly supplied by a capillary 

 system. In many instances the walls of the capillaries have 

 ruptured owing to the degeneration of the walls of the semin- 



