36 
Variation and Correlation in Brain-Weight 
In these cases the difference is less than three times its probable error and cannot 
be considered as certainly significant. The lists are introduced merely to show the 
? 
Mean 
C. of V. 
Mean 
C. of V. 
Bohemians 
Swedes 
Hessians 
Bavarians 
Bavarians 
Hessians 
Bohemians 
Swedes 
Bohemians 
Hessians 
Swedes 
Bavarians 
Bavarians 
Hessians 
Swedes 
Bohemians 
general trend of the results. It is possible that with much larger series of brain- 
weight statistics and consequently reduced probable errors some such relation as 
that just stated might be definitely proven. 
For the sake of comparison and reference I include here tabular arrangements 
of the means and variabilities for the characters stature and age, made in the same 
way as that for brain-weight. 
Stature. 
6 
? 
Mean 
C. of V. 
Mean 
C. of V. 
Swedes 
Bohemians 
Hessians 
Bavarians 
Bohemians 
Hessians 
Swedes 
Bavarians 
Swedes 
Bohemians 
Hessians 
Bavarians 
Bohemians 
Hessians 
Swedes 
Bavarians 
Age. 
6 
? 
Mean 
S. D. 
Mean 
S. D. 
Bohemians 
Hessians 
Swedes 
Bohemians 
Swedes 
Boliemians 
Hessians 
Hessians 
Bavarians 
Swedes 
Bavarians 
Swedes 
Hessians 
Bavarians 
Bohemians 
Bavarians 
Comparing the different characters the means seem to be entirely chaotic, but 
there is more regularity as regards the variabilities. The relative variabilities in 
stature and age for the different samples run parallel, with the exception of the 
Hessians and Bohemians in the male series. The samples which show the greatest 
variability in age of individuals included, also show the greatest variability in stature, 
and vice versa. This relation is, of course, to be expected, but the relation between 
