44 H. B. Ferris, M.D. 



Head-Height Index. 



The head-heig-ht index averages in the male 70.9, with extremes 

 of 78.2 and 62, and a variation range of 16.2. In the female the 

 average is 72.5, the extremes 80.2 and 67.. and the range of varia- 

 tion 13.2. The head height relative to the length seems therefore 

 greater in the female. Chervin found an average index in the 

 male of 73.57 and in the female 74.61, the Expedition of 1912. 

 an average index of 68.6 in the male. 



The seriation table shows that 2.4% of the males are ortho- 

 cephalic (58-62.9), 97.6% hypsicephalic (63-) and none chamae- 

 cephalic (-57.9). In the females none belong to the orthocephalic 

 or chamaecephalic groups, 100% being hypsicephalic. Relatively 

 high heads seem to be a marked character of the Quichua, and 

 especially of the female. 



Head Height-Breadth Index. 

 The average head height-breadth index in the male Quichua 



• o^ ^ u-i • i-u r 1 -^ • o ^ / average head height X 100 \ 



IS 89.3, while m the female it is 89.6 r ^ r — nr — iic ) 



-^ V average head breadth / 



which agrees closely with the former results of 89.2. This places 

 the Quichua high among the races in respect to this index, which 

 varies racially from 75.3 to 97.5 (Martin 8). 



The average face breadth-head breadth index in the male is 

 94.0, which corresponds closely to the results of the previous 

 expedition (94.2), and in the female 92.4. Both male and female 

 are therefore cryptozygous. 



The data for estimating the gonio-zygomatic index were not 

 obtained. Our former results showed an average index in the 

 male of 73.5. which is low in comparison with that of other races. 



Cranial Capacity and Brain Weight. 

 If we estimate the brain weight from the stature (brain weight 

 for males equals stature in centimeters x 7 ; for females equals 



stature in centimeters multiplied by [ ^ ^^\ we obtain for the male 



Quichua 1 108.8 grams and for the female 987.2 grams. By the 

 use of Gladstone's (5) formula, which holds true for ages from 



^ / . , . LxBxH (auricular) in centimeters \ 

 20 to 46 (weight in grams = ^^ ) vve 



find for the male a brain weight of 1361. grams and for the 

 female a weight of 1209.2 grams. 



