70 
Anthropometry of Modem Egyptians 
where both cranial and cephalic indices have been found for the same race. The 
means are in general of different weights for the two indices, but no attention was 
paid to the difference, and equal weights were assumed. 
The coefficient of correlation between the indices is + 0 - 818 + 0'034. The 
mean cephalic index is 80"90 and the mean cranial index 78 - 32 ; the respective 
standard deviations are 3'063 and 4'282 (so that skulls are more variable than 
living heads), and the equation to the line of regression is : 
Aa s = 0-9502 Aa 7i , 
where Aa s and Aa/ ( are the deviations of the cranial and cephalic indices respectively 
from their means. 
The equation may be written also in the form : 
« s = 0'9562a 7l + 0-96, 
which, it will be noticed, does not altogether agree with the form of that obtained 
from the above theory, since the absolute term differs in sign. 
The amount to be subtracted from the cephalic index is (a h — a s ), or 
0 - 043Sa /( — 0'96, an expression which gives the following corrections : 
a h = 60 - (a h - a s ) = - 1"67 
70 -2-11 
80 - 2-54 
90 - 2-88. 
For average skulls, therefore, the resulting correction has a value intermediate 
between those mentioned by Deniker. 
(10) The accompanying figure exhibits the general dependence of the one 
index on the other, and had a few outlying discrepant cases — mostly of small 
weight — been rejected, the general agreement would have been more marked. 
The conclusion is that we may reduce the mean cephalic index by subtracting 
2'5 units on the average*. 
(11) The material has been classified by mudirias (provinces), and governor- 
ships (large towns), and with the original purpose for which the work was under- 
taken in mind, I have subdivided the subjects from Aswan mudiria into those 
from Aswan Town, those born north of the town, and those born to the south of 
it, who may be considered as Nubians proper. The population of Aswan Town 
is very heterogeneous, and besides a large number of Nubians there are many 
Egyptians, and a greater proportion of Sudanese than in any other town. The 
effect of this heterogeneity is manifested in the relative greatness of the coefficient 
of variation which is the greatest in all the tables except the first (i.e. that of 
head length). 
* [This is not really applicable to the case of the individual head ; it is an interracial and not an intra- 
racial result. Editor.] An investigation of the intraracial correspondence is in progress at the School 
of Medicine, Cairo. 
