472 CATHARINE LINES CHAPIN 



them having advanced at least as far as stage e. No mitoses 

 are in progress. The germinal epithelium is thick and scarcely- 

 distinguishable from the outer ends of the cords of Pfliiger ex- 

 cept that in places, the strands of stroma on either side of a 

 cord of Pfliiger are uniting at their distal ends to form the begin- 

 ning of the definitive albuginea. The rete ovarii, small in cross 

 section compared with the rete testis, extends only a short dis- 

 tance into the ovary. 



The Wolffian body, in both females, is represented only by the 

 epoophoron and paroophoron. In N25 the Wolffian duct has 

 completely atrophied, but in N24 it still persists, though it is 

 exceedingly small in diameter. The Mtillerian duct is large 

 and lined with ciliated epithelium. The mouth of the ostium 

 abdominale is becoming convoluted. A macroscopic study shows 

 the uterus large, with a thick, muscular wall. 



h. Condition in the free-martin 



The three free-martins, 13, 2 and 4 (figs. 12 to 16) resem- 

 ble each other in regard to some structures. All have well 

 developed rete with distinct lumina in the cords. All have 

 distinguishable medullary cords, although in case 4 they are 

 relatively fewer in number and more widely separated by the 

 connective tissue stroma. In every case the albuginea is a 

 wide, compact layer, and the superficial peritoneum is a thin 

 epitheUal layer as in the male; the cortex, cords of Pfluger, is 

 absolutely lacking. 



Fig. 13 Cross section through middle of gonad and Wolffian body of 20 cm. 

 free-martin T13. 1, degenerating Wolffian tubules; 2, urogenital fold; 3, super- 

 ficial epithelium like that oi & ; 4, rete; 5, medullary cord connecting with rete 

 (as seminiferous tubule connects with rete in cf ) ; 6, medullary cord; 7, albuginea. 

 X 20. 



Fig. 14 Cross section through middle of gonad of 21.5 cm. free-martin, T2. 

 1, sex cords resembling medullary cord; 2, rete; 3, sex cords resembling semi- 

 niferous tubules; 4, Wolffian duct in fold of peritoneum overhanging gonad; 5, 

 rudiment of Wolffian body. X 20. 



Figs. 15 and 16 Cross sections through gonad and Wolffian body of 22.5 cm. 

 free-martin, T4. 1, Wolffian tubules (epoophoron); 2, rete; 3, sex cord; 4, Wolf- 

 fian duct in fold of peritoneum overhanging gonad ; 5, sex cord connected with 

 rete. X 20. 



