Bauhaus-Universität Weimar

vin.] DISCUSSION OF THE DATA OF EYE COLOUR. 145 
about only two-thirds of the grandparents, but this 
will suffice for our purpose. The results are given in 
Table 16. 
It will be observed that the distribution of eye-colour 
among the grandparents of the hazel-eyed families is 
nearly identical with that among 'the population at 
large. But among the parents there is a notable 
difference ; they have a decidedly larger percentage 
of light eye-colour and a slightly smaller proportion 
of dark, while the hazel element is nearly doubled. 
A similar change is superadded in the children. The 
total result in passing from generations III. to L, is that 
the percentage of the light eyes is diminished from 
60 or 61 to 45, therefore by one quarter of its original 
amount, and that the percentage of the dark eyes is 
diminished from 26 or 27 to 23, that is by about one- 
eighth of its original amount, the hazel element in 
either case absorbing the difference. It follows that 
the chance of a light-eyed parent having hazel off¬ 
spring, is about twice as great as that of a dark-eyed 
parent. Consequently, since hazel is twice as likely to 
be met with in any given light-eyed family as in a 
given dark-eyed one, we may look upon two-thirds of 
the hazel eyes as being fundamentally light, and one- 
third of them as fundamentally dark. I shall allot 
them rateably in that proportion between light and 
dark, as nearly as may be without using fractions, and 
so get rid of them. M. Alphonse de Candolle1 has 
1 Hérédité de la Couleur des Yeux dans l’Espèce humaine,” par 
M. Alphonse de Candolle, “ Arch, Sc. Phys, et Nat. Geneva,” Aug, 1884, 
3rd period, vol. xii. p. 97. 
L
        

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