DATA FOE THE PROBLEM OF EVOLUTION IN MAN. 
233 
Table IV. 
Race. 
Mean. 
Standard 
deviation. 
Correlation. 
Number. 
Male French: 
Capacity. 
Cephalic index. 
1473-05 
79-8 
107-33 I 
4-078 J 
-1437 ± -0883 
j 
56 
Male Mcdaijs: 
Capacity. 
Cejahalic index. 
1429-76 
81-9 
100-243 1 
5-127 J 
-0331 ± -0773 
1 
76 
Male Etruscam: 
Capacity. 
Cephalic index. 
1455-9 
78-5 
135-87 4 
3-322 J 
-2157 ± -0729 
78 
Female Etruscans: 
Capacity. 
Cephalic index. 
1323-6 
78-3 
110-77 1 
3-300 J 
-1443 ± -1071 
38 
We see that the correlation is in all cases positive, but it is small, and in three of 
the cases given is hardly sensible considering the size of the probable errors. On the 
whole, I think we must conclude that while there is only a small relationship between 
cephalic index and capacity, yet that in brachycephalic races greater roundness points 
to greater ca 2 )acity, and in dolichocejjhalic races less roundness jioints to greater 
capacity. In either case the emjjhasis of the racial character denotes an increase of 
cajDacity. 
Accordingly, while we have been able to draw some interesting general conclusions 
as to the relationshi^J of ljrachyce}Dhaly and capacity, it will be clear that the 
correlation here is far too uncertain to base any reliable reconstruction formula upon 
it. The regression formula for cajiacity in tliis case will be found to have, on the 
whole, the largest jirobable error, and to give the worst results when applied to test 
cases selected at random."'^ 
(7.) I turn to the general regression formulie for the determination of capacity. 
These are given for the Aino and Germans of both sexes in Tables V. to VIII. It 
will be seen from these tables that the reconstruction formulae based on the cejihalic 
index has in each case the largest }irobable error. Further, a very slight examination 
ot the tables confirms the remark already made that for the Aino the length is a more 
imijortant factor than the breadth, and that for the Germans tlie breadth is more 
important than the length as far as capacity is concerned. In the formei' race, 
* ilie general result as to cephalic index agrees with that obtained by Dr. Fn.vxz BoAS, ‘American 
Anthropologist,’ N.S., July, 1899, “ Tlic Cephalic Index,” p. L18. - 
VOL. CXCVL.—A, 2 H 
