68 
SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 
The relation between the breadth of the face and the size of the 
head is such, that in general larger heads will show larger and hence 
also absolutely broader faces than small ones. But, as the ratio of 
the cephalic module to the face breadth indicates, being in the nar- 
rowest faces as 121.5 and in the broadest as only 112.8 to 100, the 
face augments at a greater rate than the size of the head.. The same 
condition of more rapid facial growth was shown above in relation 
to the separate head diameters. And as what is true in this respect of 
the breadth is also true of the height of the face, it may be concluded 
that, while in the main correlated in growth with the length and 
breadth of the head, yet large faces show also a degree of develop- 
ment independent of these factors. The causes of such growth are 
probably partly of hereditary and partly of acquired, especially func- 
tional nature (connected with the use and development of the muscles 
of mastication). 
KHABOA OASIS, MEN: BREADTH OF FACE IN RELATION TO BREADTH, 
FORM, AND SIZE OF HEAD 
33 narrowest faces (12.6 cm. and below) 
1 8 broadest faces (13.7 cm. and above) 
Diameter 
bizygomatic 
maximum 
Breadth 
of head 
Cephalic 
index 
Cephalic 
module 
Diameter 
bizygomatic 
maximum 
Breadth 
of head 
Cephalic 
index 
Cephalic 
module 
cm. 
cm. 
cm. 
cm. 
cm. 
cm. 
11. 8 
14.0 
78. 6 
14.80 
13-7 
14.2 
74-7 
15-68 
12.0 
13-2 
70.7 
15.02 
13-7 
I4.I 
75-8 
15.00 
12. 1 
12. 1 
12.4 
13.0 
12.8 
I4.I 
73-4 
70.3 
75-8 
14.63 
14-43 
I5.I8 
13-7 
13.7 
13-7 
14.9 
I 4 .6 
I 4 .8 
80. i 
75.6 
77-1 
15.77 
15.80 
15.80 
12.5 
13-4 
70.9 
15.08 
13-7 
15-0 
77-3 
15-77 
12.5 
13-9 
72.8 
15.27 
13-8 
14.2 
75-1 
15-45 
12.5 
13-6 
73 -i 
14-95 
13-8 
15.2 
80.0 
15-87 
12.5 
13-6 
71.6 
15.22 
13.8 
13-4 
7i-3 
14.98 
12.5 
14-2 
75-5 
15-20 
13-8 
14.2 
77-6 
15.32 
12.5 
13-6 
72.0 
I5.I8 
13.8 
14-4 
71.6 
15-85 
12.5 
I 4 .2 
75-5 
15.33 
13.8 
14.4 
77-4 
15-27 
12.6 
14.8 
77-i 
15.67 
13.8 
14.8 
77.1 
15.78 
12.6 
13.8 
73-0 
15.25 
13.9 
I4.I 
73-4 
15.37 
12.6 
I4.O 
76.1 
15.07 
13-9 
14.4 
75-o 
15-77 
12.6 
- 13-8 
75-0 
15-22 
13-9 
14.3 
76.1 
15.52 
12.6 
13-4 
70.2 
15.23 
14.0 
14.6 
76.4 
15-67 
12.6 
13-5 
71.8 
15.23 
14.0 
14.4 
74-6 
15-62 
12.6 
I3-I 
68.2 
14-95 
12.6 
13-6 
75-3 
15-33 
12.6 
14.0 
76.9 
15.07 
12.6 
13-6 

71.2 
15.25 
Averages : 
12.45 
13.7 
73.4 
15.12 
13.8 
14.45 
75.9 
15.57 
(II. 8- 
(12.8- 
(68.2- 
(I4.43- 
(13.7- 
(I3-4- 
(7i.6- 
(14-98- 
12.6) 
14.8) 
78.6) 
15.67) 
14.0) 
15.2) 80. l) 
15.87) 
