A CONTRIBUTION TO THE STUDY OF THE SCOTTISH SKULL. 



399 



Table XLII. 



Race. 



B' and L. 



B' and B. 



B' and H. 



B' and C. 



M. 



F. 



M. 



F. 



M. 



F. 



M. 



F. 



Scottish 



•37±-056 



•24±-064 



•39±-056 



•26±-061 



•28±-061 



•23±-064 



•42±-056 





Here again we observe that the correlation between the characters in the male is 

 higher than that between the corresponding characters m the female. It is evident 

 that the correlation between minimum frontal breadth and maximum length is 

 approximately equal to that between minimum frontal breadth and maximum breadth, 

 while both are slightly greater than that between minimum frontal breadth and 

 height and slightly less than that between minimum frontal breadth and capacity. 

 In the female the three correlation coefficients are practically identical. I calculated 

 these correlation coefficients in the male skulls in order to compare them with the 

 corresponding coefficients obtaining in the metopic male skulls, in the hope that 

 some light might be thrown on the condition of metopism, but I shall refer to this 

 subject in a later paper. 



It was pointed out earlier in the present communication, when comparing the 

 relative lengths of the three components, frontal, parietal, and occipital, of the 

 sagittal arc, that these varied very much, and that, according to Turner and 

 Cleland, their relative lengths being so variable they could not be regarded with 

 any degree of certainty as having either a racial or a sexual significance. According 

 to Turner also, the variability was as great in the brachycephalic type as in the 

 dolichocephalic type. 



The question as to whether there was a difference in their relationship to one 

 another has engaged the attention of other anatomists, and the idea occurred to me 

 that the correlation of these dimensions might throw some light on the subject. To 

 that end I calculated the correlation coefficients between each segment and the total 

 arc in 405 male skulls and in 100 female skulls, and the coefficients of each of the 

 segmental arcs with the greatest length, and the results are not without interest. 

 They are included in the table below : — 



Table XLIII. 



Race. 



Frontal Arc and 

 Total Arc. 



Parietal Arc and 

 Total Arc. 



Occipital Arc and 

 Total Arc. 



M. 



F. 



M. 



F. 



M. 



F. 



Scottish (400 M., 100 F.) 



•73±-017 



■57 ±-048 



•53±-025 



•54±-050 



•77±-013 



•50±-050 



