FACTORS INFLUENCING ACTIVITIES OF THE TESTIS 



37 



In accordance with the foregoing description of the scrotum as a necessary 

 thermoregulator for the testis, it has been further shown for those mammals 

 which possess a scrotum that testis grafts fare much better when transplanted 

 to the scrotal wall or into the anterior chamber of the eye (Turner, C. D., 



Fig. 20. Sections of testis during and after abdominal confinement. (Modified from 

 C. R. Moore in Sex & Internal Secretions, Williams & Wilkins, Baltimore, 1939.) (A) 

 Section of left testis to show degenerate state of seminiferous tubules after 24 days of 

 abdominal confinement. (B) Section of right testis 74 days after replacement in scrotum. 

 Observe spermatogenic activity in tubules. 



0^'^ 





Fig. 21. Effect of higher temperature applied to external surface of guinea-pig testis. 

 Water, 47°, was applied to surface of scrotum for period of 10 minutes. Testis was 

 removed from animal 12 days after treatment. Seminiferous tubules are degenerate. 

 (Modified from Moore, '39; see also Young, '27, J. Exp. Zool., 49.) 



