480 CATHARINE LINES CHAPIN 



The cords of Pflliger are formed by a second proliferation of the 

 germinal epithelium, from which they become separated by the 

 development of the definitive albuginae, just making its appear- 

 ance in the older normal female embryos studied, 23 cm. and 

 29.5 cm. In the free-martin, but one set of sex cords is formed. 

 The primary albuginea becomes a compact structure like the 

 tunica albuginea of the male. Instead of the germinal epithelium 

 of the normal female, the gonad of the free-martin is enclosed by 

 a thin layer of flattened epithelial cells like the superficial 

 peritoneum of the male. 



The rete is present in the indifferent stage and in the early 

 stages of both sexes, after differentiation. In the male it con- 

 tinues to grow larger with the testis. In the female, it gradu- 

 ally diminishes until in a 29.5 cm. 9 , it is of comparatively small 

 extent. In the free-martin the rete continues to grow large, as it 

 does in the male, sometimes to the point of becoming even 

 larger in a certain free-martin than in a male of corresponding 

 size. 



In the youngest embryos studied, 7 and 8 cm., the Wolffian 

 bodies differ in the two sexes chiefly in the larger size and num- 

 ber of Wolffian tubules of the male. The condition in the free- 

 martin is like that in the male. In larger free-martins the 

 Wolffian body is variable. In some, vasa efferentia connect the 

 rete with the Wolffian duct as in the cf , in others, there is no 

 such connections, the Wolffian body having almost entirely 

 degenerated as in the female. 



In some free-martins the Wolffian duct undergoes complete 

 atrophy, or at least atrophy of the entire anterior part. (Gonad 

 to region of the body of the uterus.) In others it is present an- 

 terior to the gonad and is connected with the rete by vasa effer- 

 entia, as in the male (no such connection is ever established in 

 the female). In some of these free-martins the Wolffian duct 

 ends blindly, anterior to the gonad. In others it ends posterior 

 to the gonad and in a few, is complete. In the latter two con- 

 ditions it lies in a fold of the peritoneum overhanging the gonad 

 just as it does in the male. 



