380 



CAEL R. MOORE 



graft consists of about 570 sections (lO/x thick), the smaller one 

 of over 450 sections. The larger graft is composed of about 

 equal amounts of seminiferous tubules and epididymis tissue, 

 while the smaller is made up almost entirely of seminiferous 

 tubules. 



Figure 3 is a cross-section of the larger subcutaneous graft and 

 shows both epididymis and seminiferous tubules as well as the 



i/.':^«^ l>i>^?,-^''- '^^-'^^'o^ 



Fig. 2 Part of section of testis graft from female guinea-pig (67 B 1) nine 

 months after transplantation, a, cells free in seminiferous tubule; ic, intersti- 

 tial cells; si, seminiferous tubule. 



character of the tissue surrounding the graft. The epididymis 

 tissue is characteristic of the testicle under normal conditions, 

 except that it does not contain spermatozoa. The seminiferous 

 tubules, however, have been modified; the entire mass of germinal 

 epithelium has disappeared, with the exception of a single layer 

 of cells next the basement membrane that are considered as 

 Sertoli cells. The tubules, though devoid of all cellular material 



