25 
wyan Cree differ from the Oxford House Cree they resemble these neighbour- 
ing Chipewyan Indians. For whereas, the two bands of Cree differ from 
each other in stature by 11-5 cm., the Chipewyan Cree differ from the 
Fond-du-lac men by only one-third of that amount, namely, 3-7 cm., and 
in the other three respects they are not to be distinguished from each other. 
This is not due to intermarriage between the two tribes, because it is 
known that they do not intermarry. Is the reason fortuitous or is it envi- 
ronmental? The narrower head and face of the Cree cause their cephalic, 
cephalo-facial, and facial indices to differ from those of the Chipewyans. 
Athapascan , Algonquian, and Siouan Stocks 
In table IX the mean measurements and indices of males and females 
drawn from each of the three great linguistic stocks of Indians in Canada 
are recorded, together with their mean sexual differences. These three 
stocks are: the Athapascan, Algonquian, and Siouan. Only in the case of 
the Siouan can these be considered as amply representative of a stock 
because each of the two former stocks is represented by only one band. 
Not, then, until more data are gathered is calculating the probable errors 
of the sexual differences worth the labour involved. 
Stature. From table X it can be seen that there are definitely signi- 
ficant differences in stature between the males and also between the females 
of these three stocks. The mean sexual differences are very similar in 
the three bands, being 138 mms. in Athapascan; 124 mms. in both Algon- 
quian and Siouan. These Athapascans are, therefore, small; the Algon- 
quians are taller, the Sioux are distinctly tall. 
Sitting Height. Between the Athapascan men and women the mean 
difference in the sitting height is 63 mms., between the Siouan, 64 mms., 
and between the Algonquian, 67 mms. 
Sitting Height Index. This mean index is practically identical for 
men and women of both Algonquian and Siouan stocks, but between the 
Athapascan men and women there is a difference of 0*9 in this index. 
Cephalic Index. The mean cephalic indices of both sexes and of all 
three groups fall between 79 and 80, actually between 78*8 and 80*5. 
As is usual, the women of each group appear to have very slightly rounder 
heads than the men. The ratios of the differences to the P.E. differences 
(Diff./P.E. diff. being 3-2 and 3-1) indicate nevertheless, that it is possible 
to discriminate between the indices of the men and also of the women of 
the Athapascan and Siouan stock. The Athapascan are at the lower and 
the Siouan at the higher end of this very narrow range. 
Head Length (Glabella ad maximum). The mean sexual differences in 
the length of head of the three stocks are almost identical, varying from 
7 ■ 2 mm. to 7 ■ 9 mm. There are no significant differences between the 
lengths of the heads of the Athapascan and Siouan men, nor of the Atha- 
pascan and Siouan women. In fact, the greatest difference in mean length 
of head of either sex or group is only 2*3 mm., and this (Diff./P.E. diff. 
2*6) is not a proved difference. 
Width of Head (Biparietal maximum). The mean sexual differences 
in width of head are 4*2 mm. between the Siouan men and women; 4*3 
mm. between the Athapascan men and women; and 5*2 mm. between the 
