196 Pigmentation Survef/ of School Children in Scotlaiid 
this investigation show, one would still have the two classes, just as though there 
had been no intermarriages in these classes at all. Pearson* has shown that 
preferential mating is likely to be operative against the dark-eyed class and he 
also shows from Galton's data that they are more fertile under their present 
environment than say the light-eyed. The results of the present analysis do not 
tend to confirm this (see Table XXXIX.), but it must be remembered that the 
comparison was not made between births with respect to possibly fertile wives 
and pigmentation, but between births per family and pigmentation. Thus, with 
TABLE XL. 
Association of Colour Classes in the same Regions. 
Values of r the correlation coefficient. 
Hair 
Eyes 
Fair 
Ked 
Medium 
Dark 
Jet 
Black 
Blue 
Light 
Medium 
Dark 
Fair 
Red 
Medium ... 
Dark 
Jet Black ... 
Blue 
Light 
Medium ... 
Dark 
1 
•3074 
1 
-•6916 
•0873 
1 
- ^0867 
-•5881 
- ^6459 
1 
•3733 
- ^3414 
- ^9039 
•8443 
1 
•7207 
•0324 
- ^9431 
•5075 
•8728 
1 
- ^3044 
- ^3966 
•2273 
•1166 
- ^2565 
- ^4329 
1 
- -5786 
•3858 
•8563 
- ^6295 
- ^8211 
- ^8226 
- ^0905 
1 
- •4233 
•0022 
•6874 
- ^5110 
- ^5200 
- ^5429 
- ^4290 
•6991 
1 
TABLE XLI. 
Classes, excesses of which are found together in the same regions. 
Hair 
Eyes 
Fair 
Ked 
Medium 
Dark 
Jet 
Black 
Blue 
Light 
Medium 
Dark 
Hair: 
Fair 
Red 
Medium 
Dark 
Jet Black ... 
-1- 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
H- 
-1- 
-1- 
Blue 
Light 
Medium 
Dark 
+ 
-1- 
+ 
+ 
+ 
+ 
-1- 
The rows or columns show for any one class what other classes are associated with it. 
* Pearson : Phil. Trans. Vol. 195, pp. 79—150; and Grammar of Science, 1900 ; page 428. 
