Bauhaus-Universität Weimar

VIII.] DISCUSSION OF THE DATA OF EYE COLOUR. 147 
tend to neutralise each other. In Table 20 I have 
separately classified on the same system all the families, 
78 in number, that consist of six or more children. 
These data enable us to test the trustworthiness of the 
law as applied to individual families. It will be 
seen from my way of discussing them, that smaller 
fraternities than these could not be advantageously 
dealt with. 
It will be noticed that I have not printed the number 
of dark-eyed children in either of these tables. They 
are implicitly given, and are instantly to be found by 
subtracting the number of light-eyed children from 
the total number of children. Nothing would have 
been gained by their insertion, while compactness would 
have been sacrificed. 
The entries in the tables are classified, as I said, 
according to the various combinations of light, hazel, 
and dark Eye-colours in the Parents and Grand-Parents. 
There are six different possible combinations among the 
two Parents, and 15 among the four Grand-Parents, 
making 6 x 15, or 90 possible combinations altogether. 
The number of observations are of course by no means 
evenly distributed among the classes. I have no returns 
at all under more than half of them, while the entries 
of two light-eyed Parents and four light-eyed Grand- 
Parents are proportionately very numerous. 
The question of marriage selection in respect to 
Eye-colour, has been already discussed briefly in p. 80. 
It is a less simple statistical question than at a first sight 
it may appear to be, so I will not discuss it farther. 
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