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ALICE M. BORING. 



dividing cells, or of any spermatocytes or spermatozoa. These 

 cells are evidently quiescent early spermatogonia. 



The abundant interstitial substance shows no marked differ- 



FIG. i. Section through testis of just-hatched chick, showing seminal tubules 

 in outline, interstitial spaces, and testis sheath. X 100. 



entiation. It looks like embryonic connective tissue (Fig. 2). 

 The fibers run in all directions. The nuclei are mostly round, 

 but some of them are elliptical or irregular in shape. However, 



--F 



FIG. 2. Portion of Fig. i, showing nuclei and fat (F) in interstitial tissue. 

 C = blood corpuscles. X 1,000, 



the nuclei in the connective tissue sheath of the testis are all 

 typical elliptical connective tissue nuclei. Why this difference? 

 One cannot help noticing that the texture of the interstitial 



