72 



HAYATO ARAI 



The same reasoning may be used to explain the relations found 

 in the surviving ovaries in series I and series II in which the 

 number of ova is, however, only sUghtly different. Possibly 

 the surviving ovaries have in general been so stimulated by the 

 operation of removing the right ovary that they are less sus- 



TABLE 7 



The mean number of ova in the left surviving ovary and in the left ovary of the 



controls 



TABLE 8 



The ratios of the weight, as well as of the total number of ova in the surviving ovary 

 to those of the controls which were taken as the standards 



1 This small ratio of 0.42 was due to the appearance of the corpora lutea in 

 the ovary of the control, and the absence of corpora lutea in the corresponding 

 semispayed ovaries. 



ceptible to the influences represented by the presence of the male, 

 and hence the numbers of ova differ less though in the same sense 

 than in the case of the controls. 



WTien, however, we examine the data on the number of the 

 well-developed normal follicles, as well as the middle-sized and 

 large degenerate follicles, and the number of corpora lutea, we 



