360 ^Journal of Comparative Neurology and Psychology. 



accordance with the 5th root of the body weight (i.e., from the 

 body weights of 135 to 305 gms.) is found to be 0.2 per cent less 

 than the sum of the corresponding values determined by the form- 

 ulae, all of which indicates substantial agreement between the three 

 series. 



The following table 6 gives the weight of the central nervous 

 system according to sex. In 68 per cent of the groups the male is 

 the heavier, and the values for the male exceed those for the female 

 by 0.8 per cent. The difference is slight, but as already pointed 

 out it seems probable that it is real. 



TABLE 6. 



Weight of the central nervous system according to sex. Those male groups which 

 are heavier are marked with a star (*). 



Body weight. 



Weight of central nervous system observed. 



Male. 



Female. 



