THE ABSENCE OF DOMINANCE 67 



an accuracy to which they are not entitled, they found 

 no very clear Mendelian ratio. It was therefore de- 

 sirable that further data should be collected from the 

 records of more recent breeders known to be reliable 

 and careful beyond the average ; and this was done 

 by the present writer in a paper published in 1908 

 in the " Scientific Proceedings of the Royal Dublin 

 Society." Two other sets of data have since been 

 collected : one by Mr. Robert Bruce, from the records 

 of Mr. Amos Cruickshank, the famous breeder, and 

 published in 1908 in the Breeders^ Gazette, and the other 

 collected in America by Professor E. N. Wentworth 

 and published in the American Breeders' Magazine in 

 1913. The four sets of data are brought together in 

 the following table, in which BP represents Miss Barring- 

 ton and Professor Pearson's, Wn the present writer's, 

 Br Mr. Bruce's, and Wh Professor Wentworth's : 



1 



