218 Pigmentation Survey of School Children in Scotland 
proportions occurs in every district of the city. In St RoUox, Dennistoun, Calton 
and Bridgeton, the excesses are not so marked in the boy population. Excess of 
dark hair is characteristic in a marked degree of Anderston and Tradeston, Gorbals 
and Hutchesontown. In other densely populated centres the girl population also 
shows excesses of this class. Jet black hair is in excess in the Tradeston group. 
Blue eyes is in excess only in the Partick group ; light eyes in Anderston ; 
medium eyes in Dennistoun and the Bridgeton and Tradeston groups ; dark eyes 
in Anderston, Milton, Govan and the Tradeston group. 
(4) The environs of Glasgow diverge in a much less degree from the general 
population. The population is not so dark as in the city. 
(5) The deficiencies in the blue-eyed and fair-haired classes are due to the 
presence of a complex group which, with a darker colour specification, creates 
deficiencies in these classes. This complex group includes Highland, Irish, and 
foreign populations. 
(6) It cannot be said from the data whether these classes (fair hair; blue eyes) 
are less fitted for town life or whether this theory would account for any of the 
low percentages of these classes. The low percentages are on the other hand 
explained by the presence of the darker Scoto-Keltic and non-Scottish elements. 
(7) The Scoto-Keltic, Highland or Gaelic speaking population appreciably 
affects the distribution of colour and helps to explain excesses in dark hair and 
light and blue eyes. 
(8) The Irish population, a very large one, also helps to explain the large 
excesses in dark and jet black hair and probably light eyes where they occur. 
(9) The foreign element helps largely to explain why Tradeston and Gorbals 
diverge so widely from the rest of the population. The presence of other non- 
Scottish groups in this part of the city is probable. 
(10) The country north-east and almost contiguous to Glasgow might con- 
tribute in some degree to excess of dark eyes, since these parts (Stirling, Perth, 
etc.) have an excess of this class in their own populations. The greater fertility of 
the lower classes, and of the dark-eyed portion particularly, might contribute to 
explain the excess of this class. 
(11) Excess of medium hair and medium eyes cannot be accounted for by the 
presence of a Scoto-Keltic element or of a non-Scottish element or by the migra- 
tion of excesses of Scottish members of these classes from rural districts to the 
city. Excesses of these classes are not found to any extent outwith densely 
populated centres. 
(12) The excesses may be due to blending of fair and dark populations or to 
greater fertility of the mediuna classes, or to both these causes, 
