J. I. Craig 
71 
The people of Daqahlia, Qaliubia, and especially Sharqia, are generally 
considered to have a considerable strain of Arab (Bedawi) blood. The Fayum, 
which is the most isolated portion of the country, was colonized by Macedonian 
and other Greeks in Ptolemaic times : it is for anthropologists to say whether the 
dolichocepbaly of that province is the result of this foreign colonization, or is due to 
the isolation of the province and the freedom of the inhabitants from admixture. 
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-H- 
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t J 
t 
82 83 84 85 86 87 
Fig. 1. Diagram showing the relation between cranial index (a s ) and cephalic index (a h ). 
a s = 0-9562a A + 0-96. 
(12) For purposes of computation, the material was classified into arrays with 
intervals selected so that the whole of the population of each mudiria would fall 
into from 12 to 20 arrays. In the case of the two smaller groups of 52 and 95 from 
Aswan, the means, etc., were derived from the expanded and not the condensed 
statistics. To ensure the accuracy of the arithmetic, all means, standard deviations 
and correlations have been computed twice with independent bases, which generally 
differed by the unit of one array. The extra labour has, of course, been considerable, 
but the gain in certainty warrants it. 
(13) The tables are self-explanatory, n is the number of subjects in each 
district ; M is the mean ; er the standard deviation ; V the coefficient of variation ; 
Em> E<t an d Ey the respective probable errors of these quantities. 
