360 



DR MATTHEW YOUNG. 



equal to fully four units, although the index derived by dividing the mean breadth 

 by the mean length gives a value approximately equal to that given by the present 

 series. Of course, such a value is only an approximation to the mean, as it differs 

 from the true mean by a quantity dependent upon the variation and correlation 

 coefficients of the absolute measurements (Pearson). It is interesting to note that 

 the mean value of the index in the Renfrewshire group of 11 females is practically 

 the same as in the present series of loo. 



Turner gives no figures for females alone in the various groupings according to 

 i lie value of the respective indices, but takes the male and female together in arriving 

 at his results. We must therefore combine the male and female groups to get figures 

 comparable with those given by Turner. 



Table XL 



Cephalic Index. 



West Scottish Series. 



Turner's Series. 



Class. 



F. (100). 



M. (405). 



M.&F. (505). 



M. & F. 



Dolichocephalic 



Mesaticephalic .... 



Brachycephalic .... 



per cent. 



36 

 (a) 34 



54 



(h) 20 

 10 



per cent. 

 57-3 

 31-8 

 40-5 



8-6 



2-2 



per cent. 

 53 

 32-2 

 43T 

 10-8 

 3-7 



per cent. 

 28 



52 



20 



We observe from the above table the distinctly greater tendency towards brachy- 

 cephaly in the female than in the male skull, and how that grouping the male and 

 female crania together brings the proportions in the various groups slightly, but not 

 to a marked extent, nearer to those obtaining in Turner's series. 



As regards the vertical index we may examine the following table : — 



Table XII. 



Class. 



West Scottish Series. 



Turner's Series. 



F. (100). 



M. (405). 



M. & F. (505). 



M. & F. 



Chamsecephalic .... 

 Metriocephalic. .... 

 Hypsicephalic .... 



per cent. 



46 



49 



5 



per cent. 



38-5 



54-3 



7-1 



per cent. 

 40 

 53-2 

 6'7 



per cent. 

 43 

 45 

 11 



It will be seen that the proportions in the three groups in the case of the female 

 series are not greatly different from those in the male series. In the female we 

 have 7 2 per cent, more in the chamsecephalic group, 5 per cent, less in the metric- 



