24 Variation and Correlation in Brain-Weight 
Taking the gross values given in Table I the following Table II has been 
prepared to facilitate comparison. 
TABLE II. 
Brain-iueight Types. 
Hessians 
Bavarians 
Swedes 
Bohemians 
Total Males 
Mean brain-weight 
Mean age ... 
Mean stature 
1391-737 
42-889 
167-359 
1363-185 
43-171 
166-549 
1400-481 
45-024 
169-789 
1454-839 
45-699 
Young Males 
Mean brain-weight 
Mean age 
Mean stature 
1405-756 
31-572 
167-294 
1369-110 
35-582 
1415-267 
36-317 
170-176 
1460-150 
40-545* 
169-417 
Total Females 
Mean brain-weight 
Mean age ... 
Mean stature 
1259-875 
44-795 
156-688 
1220-356 
40-333 
154-712 
1252-682 
47-639 
158-710 
1310-914 
41-447 
Young Females 
Mean brain-weight 
Mean age 
Mean stature 
1280-202 
34-OGl 
156-980 
1235-504 
32-731 
1269-488 
35-689 
159-673 
1313-910 
35-613t 
157-650 
It is apparent at once that, considering the magnitude of the probable errors, 
there are significant differences between the Bavarians, Swedes, and Bohemians, 
with respect to brain-weight, in both sexes and age classes. Between the Swedish 
and Hessian means the differences are smaller, and as the following table shows, 
are not significant when their probable errors are taken into account : 
Total Males: Swedish mean — Hessian mean = 8-744 + 4-952. 
Total Females: Hessian mean — Swedish mean = 7-193 + 6-065. 
Young Males: Swedish mean — Hessian mean = 9-511+6-331. 
Young Females: Hessian mean — Swedish mean = 10-714 + 8-197. 
In no case is the difference as great as even twice its probable error, hence we 
must conclude that the differences exhibited might, so far as the extent of material 
allows us to judge, be due to random sampling. 
* This value was calculated by taking the first four age classes of the "total" series. It includes 
more individuals than the "young" series for the other characters. This was the only way in which 
the mean age of the "young" series in this case could be even approximated to, as the raw material 
given by Matiegka is incomplete in this respect. The age as given is probably a little too high, but the 
error cannot be great. 
