PLATE 1 
EXPLANATION OF FIGURES 
Figures 5 to 22 inclusive, represent a series of camera lucid: drawings show- 
ing the volumetric increase and decline during the different seasons. The series 
also represents several variations in form. 
5and 6 Average size of testis on July 30. 
7and 8 Average size of testis on August 30. 
9and 10 Average size of testis on September 25. 
ll and 12 Average size of testis on October 13. 
13 and 14 Average size of testis on October 21. 
15 and 16 Average size of testis on November 20. 
17 and 18 Average size of testis on January 5. 
19 and 20 Average size of testis on March 30. 
21 Average size of testis on April 20. 
22 Average size of testis on May 5. 
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