473 
1911-12.] On Inheritance of Hair and Eye Colour. 
Now, some of these types are very difficult to distinguish, especially in children. 
Of the varieties which are very difficult to distinguish are : (1) the mixture of yellow 
and grey from the mixture of chocolate and grey, a small amount of chocolate pig- 
ment being not unlike yellow ; and (2) the mixture of chocolate and grey from the 
mixture of chocolate and blue, the connective tissue of the latter simulating grey 
pigment when masked by a veil of chocolate pigment. 
Last summer I examined a school of nearly one hundred children in Skye, a 
school where the population may be considered free-mating and uncontaminated by 
immigration. As each child was shown to me I stated to an amanuensis my decision 
concerning the eye colour, and the numbers are as follows : — 
Class 1. Pure blue ...... 12 
., 2. Pure grey ... 9 
,, 3. Dark yellow ...... 1 
,, 4. Chocolate ...... 4 
,, 5. Mixed blue and grey . . .23 
,, 6. Blue and yellow ..... 2 
,, 7. Blue and chocolate ..... 1 
,, 8. Grey and yellow . . . .18 
,, 9. Grey and chocolate . . . . .18 
,, 10. Yellow and chocolate .... 3 
The difficulties above mentioned show themselves at once; but if classes 3, 4 
and 10 be combined, and if classes 6, 7, 8, and 9 be also combined, we have the 
following figures : — 
Actual 
Figures. 
Theoretical * 
Proportions. 
Pure blue .... 
12 
12-39 
Mixed grey and blue . 
23 
21-54 
Pure grey .... 
9 
9-36 
Mixed blue or grey and 
chocolate or yellow 
39 
38-95 
Chocolate and yellow . 
8 
8-76 
Pure and mixed . 
91 
9P00 
These results are too close to be wholly chance, but as it is a solitary instance 
they are advanced with diffidence. They are, however, in complete accordance with 
those given in the preceding notes on “Inheritance of Hair and Eye Colour.” 
* Fitted by the method of least squares. 
