470 Journal of Comparative Neurology and Psychology. 



determined for skeletal characters in man on the one hand, and 

 those for the weights of the viscera and various physiological 

 characters on the other hand. The values of the standard de- 

 viations (in grams) and the coefficients of variation (in per cent.) 

 for the different series are shown in Table II. 



TABLE II. 



Comparison of Different Races iu Respect to Variation in Brain- 

 weight and Skull Capacity. 



'Pearson, '97, p. 321. 

 'Pearson, '97, p. 1,1,^. 



^W. R. Macdonell, :04, p. 221. 



The values of the probable errors of these constants are 

 such as to show that the differences in variability between the 

 different races are not significant, but merely such as might 

 arise from random sampling. The following scheme shows the 

 general trend of the results with respect to the relative variabil- 

 ity of the different races. The races are arranged in descend- 

 ing order of mean brain-weight in the left-hand columns, and of 

 variability (measured by the coefficient of variation) in the 

 right hand columns. The lists are based on the total series. 



Mean 

 Bohemians 

 Swedes 

 Hessians 

 Bavarians 



C. of V. 

 Bavarians 

 Hessians 

 Bohemians 

 Swedes 



Mean 

 Bohemians 

 Hessians 

 Swedes 

 Bavarians 



C. of V. 

 Bavarians 



Hessians 



Swedes 



Bohemians 



From these lists it would appear that as a general rule the 

 higher the mean brain-weiglit is, the lower will be the variabil- 

 ity. But it must be kept in mind that none of the differences 

 in the variability columns are significant. Taking the extremes, 

 Bavarians and Swedes for the males, and Bavarians and Bohem- 



