6 SCIENCE PROGRESS. 



would raise the upper limit of dolichocephaly two or three 

 units. 



The following table gives the distribution of the cephalic 

 indices in the five Departments, in the case of Dordogne a 

 further analysis is made which proves that the southern 

 part of that Department is much more brachycephalic than 

 the northern. The mean index of this Department, if alone 

 considered, gives extremely little information. 



CEPHALIC INDEX— PROPORTION PER CENT. 



It is evident that this table indicates considerable 

 differences in the ethnic constitution of each Department. 

 Taking the extremes, we have on the one hand, North 

 Dordogne with its 8*5 per cent, of indices below 75, or 

 Charente with 57 and only '5 of ultrabrachycephals and 

 Correze on the other which has no dolichocephal below 

 75, but has 8*i per cent of indices over 90. 



Taken as they stand, the great majority of these 

 indices fall into the brachycephalic division, while very few- 

 are dolichocephalic. 



The mean index of the French population being 83*57, 

 Dr. Collignon, in order to simplify matters, describes as 

 brachycephals those indices above 83. The cantons which 

 come under this grouping form a compact mass to the south 

 and south-east as is seen in the accompanying map. To the 

 north there are two islands in which the index does not 

 exceed 83 - 8. 



