38 Pigmentation, Susceptibility and Race Selection 
holding approximately for the European races, do not necessarily hold good among 
other races. The dark-haired Chinaman, for instance, suffers more severely from 
diphtheria than the European. It would be unwise, therefore, to draw any con- 
clusions by analogy as to susceptibility and recuperative power in these fevers 
among the various races according to their pigmentation. 
(8) Conclusions. From the statistics already given it has been shown in the 
four acute fevers here considered, namely, scarlet fever, diphtheria, measles and 
whooping cough, that among Glasgow school children : 
1. The medium-haired child is more liable to become infected than the 
red-haired and, much more so, than the dark-haired and jet black-haired child. 
The fair-haired child occupies an intermediate position as regards infection. 
2. The medium-eyed child is more liable to become infected than the dark- 
eyed and, much more so, than the blue-eyed child. The light-eyed child occupies 
an intermediate position as regards infection. The light-eyed child appears to be 
more susceptible to diphtheria and whooping cough than to scarlet fever and 
measles. 
3. The dark-haired and jet black-haired child has higher recuperative power 
than the red-haired and, much more so, than the fair-haired child. The medium- 
haired child occupies an intermediate position as regards recuperative power. 
4. The medium-eyed and dark-eyed child has higher recuperative power than 
the light-eyed and blue-eyed child. 
5. Combining the hair and eye colours we find that the dark-haired dark-eyed 
child has considerably more recuperative power than the fair-haired light-eyed 
child. The medium-haired medium-eyed child occupies an intermediate position 
as regards recuperative power. 
G. In the various gradations between the extreme dark and extreme fair 
types, the closer the type approximates to fair, the less recuperative power it 
has and the less resistance it offers to the diseases. 
7. The medium-haired class is undoubtedly selected both for handicap by 
its greater number of severe cases with subsequent disability, and for extermina- 
tion by its greater number of deaths. The jet black and dark-haired class is least 
selected for such handicap and extermination, while the fair-haired class is selected 
rather more and the red-haired class rather less than their proportion in the 
general population. 
8. The medium-eyed class is undoubtedly selected both for handicap by its 
greater number of severe cases with subsequent disability and for extermination 
by its greater number of deaths. The light-eyed class is next in order adversely 
selected, the dark-eyed class less so and the blue-eyed class least of all. 
