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CHARLES H. SWIFT 



in size. They also become broken up and soon make up most of 

 the mass beneath the epithehum. Although widely scattered 

 and fragmented these cords in general retain the same orientation, 

 which they had at their inception, before becoming detached 



germ. ep. 





pro. 



m.c. 



Fig. 5 Portion of a transverse section through ovary of a 65-day chick embryo. 

 This drawing, made from two sections, shows conditions during differentiation of 

 sex. Notice the cord of first proliferation, and the thick germinal epithelium, 

 containing many primordial germ-cells — a fact characteristic of the female just 

 after the appearance of the medullary cords. 



from the germinal epithelium, that is, their long axes are per- 

 pendicular to the axes of the epithelium. Before dismissing the 

 subject of the formation of these cords of first proliferation, I 

 must again repeat that they are purely of germinal epithelium 



