1905.] SCANDINAVIAN CRANIA. 11 



Basi-bregmatic Height. 



This diameter was segmented in terms of the posterior root 

 of the zygoma, which passes close above the external auditory 

 meatus. 



It will be seen that this point corresponds very accurafely 

 with the general level of the tentorium cerebelli, so that this 

 method of segmenting the basi-bregmatic height into a supra- 

 zygomatic and an infra-zygomatic segment enables us to express 

 with considerable accuracy the relative vertical heights of the 

 cerebrum and cerebellum. 



(a) Dolicho-cephalic (14). In this group the diameter under 

 consideration varied from 119 to 140 mm., giving an average 

 height of 130.5 mm. It is worthy of note that these figures 

 are materially less than among the Australian Aboriginals I 

 have recorded, in whom the average height was 135.5 mm. 



The supra-zygomatic segment varied from 100 to 113 mm. 

 giving an average of 106 mm. for the segment. Now both the 

 figures indicating individual variation and the average height of 

 the segment were very similar among the Australian Aboriginals. 

 In fact, the average height of the latter, viz. 106.1 mm. was 

 practically identical with that of the Scandinavian skulls. 

 However, when the average height of the segment is reduced to 

 a percentage of the total basi-bregmatic height, we obtain a 

 figure, 81.2 per cent., which presents a somewhat remarkable 

 contrast to that which indicated the percentage proportion of 

 the same segment among the Australian Aboriginal skulls, 

 viz. 78.1 per cent. 



The infra-zygomatic segment varied from 16 to 32 mm. 

 yielding an average of 24.5 mm. and this represented as a per- 

 centage. of the total height gives 18.8 per cent. This figure is 

 again in marked contrast with the 21.8 per cent. for the same 

 segment of the skulls of Australian Aboriginals. 



These figures are very noteworthy because, although the 

 average height of the supra-zygomatic segment was practically 

 similar in the two dolicho-cephalic races, yet the percentage of 



