404 



GA ULE. 



[Vol. VIII. 



immediately following copulation, the spleens are better sup- 

 plied with blood. A minimum quantity of blood is reached in 

 June and July, when they wander to the dry meadows. The 

 esailenta spleens contain a slightly larger proportion of 

 blood than temporaria. The female spleens are larger pro- 

 portion than the male spleens. If we compare Figs, a and b 



we find that the size of the 

 spleen is not alone dependent 

 upon the quantity of blood it 

 contains. This is notably true 

 in the months of June and July. 



Rana Temporaria. 







-2 -^ 



CI 



->>-><!c«OZQi-i 



c. EoshiopJiilojis Cell Curves. 



In general we learn from 

 these curves that the spleens 

 contain more eosinophilous cells 

 during the period of abun- 

 dant food and fewer in the hun- 

 ger period or in winter. This 

 is especially evident at the be- 

 ginning of the food period in 

 June and July. The spleen 

 contains the fewest such cells 

 in April and May. The te^n- 

 poraria spleens possess more 

 of them than the esculent a 

 spleens. The number of eos- 

 inophilous cells varies more 

 distinctly in the temporaria 

 than in the esculenta spleens. 

 The winter curves of tempo- 

 raria, male and female, reach their culmination in February. 

 The Fall culmination occurs in September. The Fall culmina- 

 tion of esc7ilenta falls in November. 



The curves of the same sex are more typically alike than 

 the curves of the same species. The male spleens contain 

 more eosinophilous cells than the female. If we compare 



Fig. b. — Blood Curves. 



