86 PROCEEDINGS OF THE ANATOMICAL AND ANTHROPOLOGICAL 



Here we observe a slight difference the non-Scottish have a 

 preponderance of " Fair " and a falling off' in " Medium ". 



8. Only two characters remain to be considered, Colour Sense 

 and Keenness of Hearing. As regards colour sense, thirteen cases of 

 abnormality have been recorded amongst the Scottish students, and only 

 one amongst the non-Scottish. In neither group is any abnormality 

 recorded in keenness of hearing. 



9. I will now show the variability of the two groups as measured 

 by the " standard deviation ". 



TABLE VI. 



STANDAED DEVIATION OF HEAD MEASUEEMENTS OF ABERDEEN 



STUDENTS IN MM. 



TABLE VII. 



STANDAED DEVIATION OF EYE AND BODY MEASUEEMENTS OF 

 ABEEDEEN STUDENTS. 



(Eye in mm., heights and span in inches.) 



Here we are dealing with much smaller quantities than in the 

 case of the Means, and the differences are therefore relatively much 

 larger. We have therefore to consider the question, do these differ- 

 ences indicate a marked divergence between the two groups as regards 

 their variability ? Before answering this question, I would remind 



