110 



SHINKISHI HATAI 



022 



018 



1.002 



50 100 150 200 250 300 350 400 450 



Chart 10 Showing the weight of hypophysis of the albino rat according to 

 body weight. The observed weights are represented by 78 male and 80 female 

 rats. 



• Observed weight, male. O Observed weight, female. 



Calculated weight, male. Calculated weight, female. 



The constants of the formulas were determined from 78 males 

 and 80 females. The relation between observed and calculated 

 values is shown in chart 10. 



• The sex difference is clearly noticeable in the rats at and after ' 

 50 grams in body weight, and it becomes greater as the rats 

 increase in weight. Before 50 grams in body weight the sex 

 difference is not evident, consequently the weight of the female 

 hypophysis prior to 50 grams should be calculated from the male 

 formula. This sex difference in the weight of the hypophysis 

 has not been shown previously in any mammal. 



