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CHARLES H. SWIFT 



cords (fig. 2). In addition a few interstitial cells are present 

 in the stroma between the cords. These interstitial cells are 

 very numerous in later stages, so that an account of them and 

 their development will be deferred until those are described. 



The seminiferous cords have a larger diameter, and now fomi 

 an open net with large interstices (fig. 2). The cords anasto- 

 mose with each other in eveiy conceivable plane and direction, 

 so that their original orientation is completely lost. This tangle 

 of cords now occupies the entire testis, the area of mesenchyme 

 under the genninal epithelium, described in a previous stage, 



iS.C 



pro. 



Fig. 2 Portion of a transverse section through the left testis of a 13 day 

 chick embryo. This section shows a seminiferous cord containing many primor- 

 dial germ-cells. Two of the germ -cells are dividing. 



