jc6 'Journal of Comparative Neurology and Psychology. 



about 2.0 per cent. Although, of course, the absolute differences 

 are here very small, the indications of a difference according to 

 sex are unmistakable. 



TABLE 4. 

 Showing the mean spinal cord weight according to sex. 



Body weight 

 gms. 



No. of cases. 



Spinal cord weight observed 

 (in gms.) 



Males. 



No. of cases. 



Females. 



Percentage difference between 

 female spinal cord weight 

 and that of the male taken 

 as the standard. 



5 

 15 



25 



35 

 45 

 55 

 65 

 75 

 85 

 95 

 105 



"5 



125 



135 

 '45 

 '55 

 165 



'75 

 185 



'95 



205 



^'5 



225 



235 

 M5 

 ^55 



Average percentage excess in the weight of the female spinal cord, 2.0 per cent. 



To discuss this result further observations are required, but 

 pending a well grounded explanation, it must be remembered that 

 Watson ('05) has shown that the bearing of young has the effect 

 of increasing slightly the weight of the spinal cord in the female, 

 and as many of the females recorded in table 4 had borne young, 

 this is probably one factor in producing the result as it appears 

 in females at or beyond the bearing age. The excess is found, 

 nevertheless, even before puberty. 



