A CONTRIBUTION TO THE STUDY OF THE SCOTTISH SKULL. 



401 



before mentioned, the tendency of the parietal to increase when the glabello-occipital 

 length increases is approximately equal in the two sexes. 



Amongst other correlations I have calculated for the Scottish series those for 

 cephalic and vertical indices and cephalic index and capacity, and they are embodied 

 in the table below : — 



Table XLV. 



Race. 



Capacity and Cephalic Index. 



Cephalic Index and Vertical Index. 



No. 



405 



100 



100 



76 



187 



56 



56 



76 



78 



M. 



No. 



97 



97 

 52 

 84 

 23 



38 



F. 



No. 



405 

 100 



M. 



No. 



F. 



West Scottish . 



„ K . 

 German . 

 Aino 



Thebans . 



Modern Egyptians . 

 Male French . 

 Male Malays . 

 Etruscans 



•091±-033 



-•013±-06 



•202±-0647 



- -3069±-0701 



-•1480±-0482 



-•1410±-0883 



•1437±-0883 



•0331±-0773 



•2157±-0729 



•15±-065 



-•0307±-0677 



- -2466±-0878 

 •0080±-0736 



- -4960±-1060 



•1443±-1071 



•301±-03 

 •211±-064 



100 



•316±-061 



Analysing the above table, there seems to be great diversity in the value of the 

 correlation coefficient, so much so that Dr Lee (13), from whose valuable paper most 

 of them have been derived, applies the term "erratic" to describe its unstable and 

 variable character. 



It will be seen that I give in Table XLV two coefficients of correlation for the 

 male skulls, one for a group of 100 and the other for one of 405. First of all, I 

 calculated the coefficient for the 100 whose mean cephalic index was 74"4, and found 

 that it was negative in value, but that the number was so small compared with its 

 probable error as to be practically negligible. I then calculated the coefficient for 

 the whole 405 male skulls with the same cephalic index, and found that a positive 

 coefficient was the result and that the coefficient was sensibly greater than its 

 probable error. The latter coefficient should be more reliable than the former, and 

 we may take it as definitely representing the correlation between the cephalic index 

 and capacity in the West Scottish male series rather than the former, which is derived 

 from a smaller number of skulls. 



The conclusion that one may draw from this positive correlation, even though it 

 is small, is that in this Scottish series a tendency to brachycephaly is associated with 

 a tendency to greater capacity. 



There would appear to be some doubt, therefore, in regard to Dr Lee's conclusion 

 on this subject, i.e. " On the whole, I think, we must conclude that, while there is 

 only a small relationship between cephalic index and capacity, yet that in brachy- 

 cephalic races greater roundness points to greater capacity and in dolichocephalic 



