KEPEODUCTIVE SYSTEM OF FREE-MARTINS 465 



The 17 cm. female N23 may also be described for comparison 

 with the 16.3 cm. free-martin T6. The ovary measures 4.39 

 mm. In cross section its area is about half that of the testis of 

 male T6. The medulla still makes up a large part of the ovary. 

 Medullary cords are found containing many primary follicles and 

 surrounded by abundant connective tissue. The cords of Pfliiger 

 are in the same condition in which they were found in the 14 cm. 



9 N26, with the exception that at their inner ends some of 

 them have formed 'nests' of cells, primary folhcles enclosing 

 primitive ova. A few germ cells are found in early growth stages. 

 There is no albuginea formed; cords of Pfliiger are still at- 

 tached to the germinal epithelium. The stroma separating the 

 cords of Pfliiger from each other is wider than that of a 14 cm. 



9 , but no interstitial cells are distinguishable. The rete ovarii 

 is much smaller in cross section and extends a shorter distance 

 into the gonad than does the rete testis. Lumina are very few 

 but have clearly defined epithelial walls. 



Degeneration o/ the Wolffian body has gone farther in the 17 

 cm. 9 than in the 16.8 cm. cJ'. The Wolffian body of the former 

 is smaller in cross section than that of the latter. The tubules 

 of the epoophoron remain in the anterior part. In the posterior 

 end are found glomeruli, fewer in number than were found in the 

 14 cm. stage. The Wolffian duct, although lacking in the 14 

 cm. 9 studied, is present in this 17 cm. 9 and complete as far 

 as it was sectioned. It is also present, though small in diameter, 

 in a 20 cm. 9 studied, showing some irregularity in time of 

 atrophy of vestigeal structures in normal embryos. The Miil- 

 lerian duct is complete. The ostium abdominale is relatively 

 larger than that of smaller females and its walls are becoming 

 convoluted. The uterine horns open into the uterus, which by 

 this stage is large and has a muscular wall. (The uterus was 

 studied by dissection.) 



h. Conditions in the free-martin 



The gonad of the free-martin is approximately 2 mm. long, as 

 compared with the 4.86 mm. testis and 4.39 mm. ovary which 

 have been described for comparison. The area of the cross 



