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Plate XXIII. ^, portion of human testis and epididymis, magnified 10 times. 

 The large circles and loops at the right are sections of the coiled tube of the 

 epididymis; the smaller tubules filling the left two-thirds of the picture are the 

 seminiferous tubules of the testis. B, area of the same testis magnified 200 times, 

 showing 5 clumps of interstitial cells between the tubules. Photographs from prep- 

 aration lent by Joseph Gillman through I. Gersh. 



