WHY WE MEASURE PEOPLE. 7 



Inversely, and as a matter of convenience, he regards as 

 dolichocephalic all the regions in which the index is less 

 than 80. Two large groups of dolichocephalic cantons are 

 isolated by this means ; the more important covers two- 

 thirds of the department of Dordogne (the valleys of the 

 Isle and of the Dronne) and about one half of Charente, 

 mainly to the south and south-east. The other has Limo- 

 ges for a centre and the seven cantons that surround it. 



In the narrow band of country between these two 

 groups the index is 81. 



Fig. 2. The Distribution of the Cephalic Index. 



Areas with an index of less than So, shaded ; those between 80 and 83, left blank ; 



those over 83, cross-hatched. 



This clearly defined distribution is of the greatest 

 importance, for alone it provides a key to the local 

 ethnography. 



Another point not less worthy of attention is the clear 

 manner in which these two head types are separated : 



1. between the two Departments of Dordogne and Correze ; 



2. between the two portions of Dordogne which are sepa- 

 rated by the rivers Vezere and Dordogne. 



As a matter of fact the boundary between the two 



