42 H. B. Ferris, M.D. 



that found in the present Hving Quichua, the difference probably 

 beins;- due to the soft tissues. 



The module varies in different North American Indians from 

 15.5 to 16.0, with a mean of 15.7. corresponding closely to that 

 of the Quichua. Hrdlicka gives the average cephalic module 

 for 50 Apache Indians having an average stature of 170 at 16.0. 



The seriation tables show that 84.7^^ of the males have a 

 cephalic module between 15.2 and 16.2, while only 36.7'^/r of the 

 females lie within this limit, none being above the highest limit. 



Cephalic Module and Stature. 

 The relation of the stature to the size of the cranium, and 

 therefore to the brain, may be shown by the cephalic module- 



sta-ture index fi^^PhaJic module x 100 y jj-, j^g j^^^le Quichua with 



V stature / 



an average stature of 158.4, this index averages loo.o, with 

 extremes of 124.4 ^^^d 86.4, and a variation range of 38. In the 

 female the average is 1.05, the extremes 122. i and 91.2, and the 

 variation range 30.9. The average is higher in the female, 

 chiefly on account of the shorter stature. This index in the male 

 of the Kharga Oasis is 94 (Hrdlicka) and in the negro (Ameri- 

 can) 95.0. The Otomi (N. A. Indian), according to Hrdlicka, 

 with an average stature of 159.3 have a head-stature index of 

 97.3, and the Apache with an average stature of 170.0 have an 

 index of 94., while the Quichua of the same average height has 

 a cephalic module of 15.8 and an index of 92.8. The Quichua 

 seems to have a head somewhat smaller for a given stature than 

 most of the North American Indians. 



The table showing the stature, cephalic module and head- 

 stature index shows that the taller male Quichua have absolutely 

 larger heads than the shorter, but not relatively to stature. The 

 changes in stature are more rapid than the changes in head size in 

 going from the short to the tall. The same is true for the female, 

 the head is larger absolutely in the taller, but relatively to stature 

 it is smaller. Also the female Quichua of the same average 

 stature as the male has a smaller head but a larger head-stature 

 index. 



Hrdlicka has shown also that in the natives of the Kharga 

 Oasis there is a relation between the cephalic index and the size 

 of the head, viz., that those with a higher cephalic index are 

 more likely to have larger heads. 



