J. F. Tocher 
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any class with light eyes. Excess of blue eyes occurs alone, but excesses of dark 
eyes and medium eyes as a rule occur together. 
XIV. It has already been shown elsewhere by the author that where there 
is an excess of light eyes in the population the number of cases of insanity is above 
the average and vice versa. It is now shown here that a greater number of cases 
of imbecility, blindness and deafness occurs in regions where blue eyes, dark and 
jet black hair are in excess. It has been already pointed out (see V.) that these 
classes are associated with the Gaelic speaking population. A direct determination 
of the relationship shows that significantly greater numbers of cases of these 
defects occur in Gaelic speaking regions than throughout the rest of Scotland. 
This is most probably due to the greater rate of emigration of the fitter portion 
from, and the relative absence of immigration to, the Highlands. 
XV. The degree of resemblance between the boy and girl populations has 
been determined. It is found that positive and negative differences in the boy 
population are mainly associated with positive and negative differences in the girl 
population in the same regions. The I'esemblance is least in the red and dark- 
haired classes and greatest among the medium-haired and blue-eyed classes. The 
resemblance is closer in eye colour than in hair colour. 
XVI. Glasgow so greatly diverges from the general population in hair colour 
and eye colour that it has been made the subject of a special investigation. The 
various municipalities constituting Greater Glasgow, as well as its environs, 
have been included in ohe investigation. It is shown that the Highland, Irish, 
foreign elements all contribute to increase the proportion of the dark-haired 
classes. Tradeston and Gorbals have greater proportions of dark hair, jet black 
hair and dark eyes, mainly due to the large foreign element present in these 
populous divisions. The detailed analysis shows that the immigrants are of 
Russian origin and this is confirmed by direct enquiry. More than 500 Jewish 
children attend school in these divisions. Dark hair, jet black hair, dark eyes are 
the leading classes in this population. The Highland and Irish elements are found 
all over the city. It is shown that the Irish resemble to a great extent in colour 
characters the Highland population. Both contribute very largely to the excess 
of dark hair. Medium hair is in excess all over the city, as expected, since this 
class is associated with density and since Glasgow contains a greater number of 
persons per square mile than any other part of Scotland. The high proportions 
of these classes (dark and medium) cause a corresponding defect in the proportion 
of fair hair in Glasgow. Only in one or two divisions, St RoUox, Dennistoun, and 
the Paisley district, does the proportion of fair hair approach the average for 
Scotland. In all the other divisions fair hair and blue eyes are distinctly below 
the average. It cannot be said from the results of this survey whether fair-haired 
and blue-eyed children are less fit for town life than the other classes, but the 
defect in fair hair at least is quite explainable on the ground that the proportion 
is disturbed (a) by a darker Scoto-Keltic or Highland element, (^) by a darker 
Irish element, (y) by a darker foreign element and (S) by the effects of blending of 
