64 



HAYATO ARAI 



In the weight of the left surviving ovary, however, we do 

 find a significant difference between semispayed and control 

 rats. With the exception of the one litter (killed at 62 days) 



TABLE 2 



The body weight and other data for both operated and control rats at the time of 



killing 



in series I, the weight of the left surviving ovary (as well as the 

 relative size of the ovary on body weight) is greater than in the 

 controls (table 3). The litter killed at 62 days in series I is 

 exceptional, owing to the appearance of corpora lutea in the 



