128 CARL R. MOORE. 



3. Spermatozoa are produced in the testis within ninety days 

 after scrotal replacement. 



4. Development of the replaced testis occurs in the presence 

 or absence of an opposite normal testis. 



5. By implication we are led to believe that congenitally 

 retained abdominal testes in man have a good chance of devel- 

 oping into normal testes if they are replaced in the scrotum at 

 a time considerably after the attainment of sexual maturity. 



6. The function of the scrotum is beautifully shown by com- 

 parison of the testis retained in the abdomen for several months 

 with a similar testis replaced in the scrotum for ninety days. 

 Only in the scrotum are spermatozoa produced in the testes. 



LITERATURE CITED. 

 Bevan, A. D. 



'18 Undescended Testes. Surgical Clinic of Chicago, 2: 1101-1117. 

 Griffiths, Joseph. 



'93 The Structural Changes in the Testicle of the Dog when it is Replaced 



within the Abdominal Cavity. Jour. Anat. and Physiol. (Lond.), 27: 



482-499. 

 '94 Retained Testes in Man and in the Dog. Jour. Anat. and Physiol. (Lond.), 



28:209-220. 

 Lipschutz, A., and others. 



'25 Experimenteller Hermaphroditismus und der antagonismus der geschlechts- 



drusen. I-III. Pflugers Archiv, 207: 548-595; IV, V, ibid., 208: 273-317. 

 Moore, Carl R. 



'240 VI. Testicular Reactions in Experimental Cryptorchidism. 



'246 VIII. Heat Application and Testicular Degeneration; the Function of 



the Scrotum. Amer. Jour. Anat., 34: 337-358. 

 '260 The Biology of the Mammalian Testis and Scrotum. Quart. Rev. of 



Biol., i: 4-50. 

 '266 IV. Testis Graft Reactions in Different Environments (Rat). Amer. 



Jour. Anat., Vol. 37: 351-416. 

 '26c The Activity of Displaced Testes and its Bearing on the Problem of the 



Function of the Scrotum. Amer. Jour. Physiol., Vol. 77: 59-68. 

 '26d The Relation of the Scrotum to Germ Cell Differentiation in Gonad 



Grafts in the Guinea Pig. Amer. Nat., Vol. (in press). 

 Moore, Carl R., and Quick, Wm. J. 



'24 The Scrotum as a Temperature Regulator for the Testes. Amer. Jour. 



Physiol., 68: 70-79. 



