254 On Inlicritance of Coat-Colour in the Greifliound 
equation of any breeder who may call his dogs ' red-fawn ' when the majority of 
breeders would call them ' red ' is sufficient to very seriously alter the results 
when only 2000 dogs are dealt with. Accordingly, our choice of 16 to 36-fold 
classifications is based on the experience that these give results substantially in 
agreement with totally different methods, and we take as our standard process 
the mean square contingency method referred to above as D. 
TABLE III. 
Correlation of Brothers and Sisters from Different Litters. 
Mean of fourfold Tables (A and B) "521 
16-fold Contingency Table E '488 
2.5-fold Contingency Table F -502 
36-fold Contingency Table D ... -509 
144- fold Contingency Table "640 
400-fold Contingency Table -760 
Lastly, in case the reader should enquire why we dealt with red pigmentation 
and black pigmentation and have not considered the inheritance of white, we 
must remark that while many of the breeders filling in Mr Howard Collins' papers 
have noted a white ear or small white patches, etc. on black dogs*, we believe 
possibly the majority, it is not certain that absolutely all have done this ; and we 
are quite sui"e that insignificant white patches are not noted in the stud-books. 
Accordingly it seemed best to confine our attention solely to tlie inheritance of 
black and red pigment. At the same time we make no statement as to our 
belief Avhether or no these pigments are qualitatively different ; we consider that 
the contingency method enables us to fairly escape any such decision. No satis- 
factory treatment of the nature of pigment in hair has so far come to our notice. 
(5) On Direct Inheritance. Parental Correlations. We place here our results 
for the data extracted from Mr Howard Collins' schedules and from the stud-books 
in the case of the four parental correlations worked out by method Contingency D. 
TABLE IV. 
Unselected Offspring 
Offspbing Selkcted fok Recokd 
Number 
Correlation 
Number 
Correlation 
Eaw 
Corrected 
Sire and Dog 
Sire and Bitch . . . 
Dam and Dog ... 
Dam and Bitch ... 
2392 
2231 
2419 
2237 
•512 
•579 
•505 
•532 
963 
913 
963 
913 
■474 
•404 
•485 
•499 
•542 
•462 
•554 
•572 
Mean 
•532 
•466 
•532 
* Such dogs have beeu classed as ' mixed black.' 
