260 
On Inheritance of Coat-Colour in the Greifhound 
in the puppy-stage than the siblings arc at a later age, and accordingly this may 
account for the lessened resemblance of stud-book pairs of brethren. It may be 
possible later to test this, but at present we can only tlirow it out as a suggestion, 
we see no other way to account for the anomalous results of the Table. 
The last column gives a result agreeing remarkably well with that for Basset 
Hounds from different litters, but the want of agreement between the first and 
last column is very striking. We can only ask : Is it due to record at too early 
a stage ? 
The above results for fraternal correlation were all found by Contingency D 
method, i.e. that of mean square contingency for a 36-fold table. For comparative 
purposes three fourfold division tables were worked out by method Red A and 
another three by method Black B. We obtained the results given below in 
Table IX. 
TABLE IX. 
Mean Sibling Resevihlance. 
Method 
Same Litter 
Schedules 
Different Litter 
Stud-book 
36-fold Cuntingoncy D 
Two fourfold Divisions A and B 
16-fold and 25-fold Contingency E and F... 
■676 
•680 
•640 
•529 
•538 
•498 
We see from this that a 86-fold contingency table gives results in sensible 
agreement with those to be found from the old fourfold division method, while in 
16-fold and 25-fold tables the result is very slightly less, showing that the grouping 
is hardly fine enough. We now pass to the comparison with man and horse, the 
TABLE X. 
Resemblance in Pigment of Siblings. 
Nature of Sibling 
Pair 
Man 
Horse 
Dog, Coat-Colour 
Eye- 
Colour 
Hair- 
Colour 
Coat- 
Colour 
Greyhound 
Basset Hound 
Same Litter 
Different 
Same 
Litter 
•Different 
Litters 
Schedules 
Stud-book 
Litters 
Brother and Brother 
Sister and Sister ... 
Brother and Sister. . . 
•517 
•446 
•462 
•623 
•693 
•583 
•661 
•700 
•669 
•524 
•595 
■558 
•521 
•558 
•509 
1 ^508 
•526 
Mean , ... 
•475 
•580 
•633 
•676 
•559 
•529 
•508 
•526 
