6 



MR. ADAIR DIGHTON ON 



tlironghoiit the series the mixed combinations very generally 

 follow the same incidence of ratio as the whole colours with 

 which they are associated. 



Let me now devote a few words to the mixed matings — that is 

 to say, the " pied " colours, in which white plays a leading part 

 on both sides. These unions, on the whole, fall into line with 

 those of melanistic character. One would have expected a higher 

 incidence of whites in these matings, but it is interesting and 

 important to note that in the red or fawn and white to red 

 and fawn and white, the hypostatic colours in the scale, there 

 are more whites than in any other matings. It seems probable 

 that the mixed colours tend to segregate into the conditions of 

 melanism and albinism of the skin and hair, giving 1 whole 

 colour : 2 mixed colours : 1 white. When we recall the instruc- 

 tion concerning the registration of colours, it is self-evident 

 that there is a A'ery appreciable chance that some mixed colQ,urs 

 are nearly white. This being so, there should be about 3 "mixed" 

 to 1 whole colour in the pied matings. 



Adding the "white" to the "pied" in the whole series, it 

 will be found that the total is 2413 "pied" and white to 689 

 whole colours, which gives a ratio of 3'5 to 1, which is sufficiently 

 close for all practical purposes. 



In conclusion, I must thank Mr. Robertson for all the 

 help he has given me in drawing up this paper and Mr. Martin 

 Duncan, our Librarian, for his kindness in furnishing me with 

 what references on the subject there are. 



WHOLE COLOUR MATINGS. 



Black X Blue. 



Matings. 231. 

 Whelps. 1338. 



Bk. 616 Be. 226 Bd. 112 R or F. 162 W. 7 

 BkW^ 118 BeW". 38 BdW. 32 R or FW. 27 



734 



264 



144 



189 



998 

 Expeclation. lOOS'o 



340 

 334 



