A. H. Sturtevant 



49 



since obtained more information however, 

 mating grays to roans. 



Below are the results of 



Colour of Foals 



Breed 

 Shire ... 

 Trotter... 



Black 

 

 1 



Brown 

 3 

 



Roan 

 7 

 4 



Authority 

 Wilson 

 Sturtevant 



11 



Total 1 3 7 



The expectation is 50 7„ of the epistatic colour, 25 7„ of the other, 

 and 25 °/„ of colours liypostatic to both, i.e. brown, bay, etc. There are 

 50 % roans, but the numbers are small, and the grays are dangerously 

 close. Wilson's tables show five grays produced among Shires by 

 mating roans to chestnuts, browns, bays, or roans, but he says a similar 

 number of cases of gray apparently carrying roan could be found. I 

 have found four cases where gray has seemed to carry roan, two of 

 which, however, are from doubtful sources, and the other two, of course, 

 might easily be due to mistakes somewhere. I have found no case of 

 roan carrying gray. Of the above four roans from gray by roan, two 

 were reported as gray roans, one was a bay roan, and one either bay 

 or chestnut roan. Of Wilson's, one is a blue roan, and the others are 

 roans, the type not being made clear. The most probable view of the 

 matter seems to me to be that the G R horses are blue or gray roans, 

 which may perhaps be sometimes mistaken for grays and recorded 

 as such. 



I did not treat dun in my paper, but Wilson has worked with it. 

 He assumes, though without saying so, that all duns are due to the 

 same factor. This may be correct, but there are certainly at least two 

 types of duns, differing from each other much more than do the bay and 

 brown he is so careful to separate. One type has black " points," and 



Gray ? 



I 



I 



Dun i 



black points 



(By Bay Clydesdale) 



I 

 Gray S 

 (By Koan, half 

 Tlioroughbred) 



I 



Grav ? 

 (By Bay Trotter) 



Gray ? 

 (By Brown) 



I 



DuHt? 



white points 

 (By Bay Saddler) 



' I 

 , I 



Duntf 



black points 



(By Bay) 



Bay i 

 (By Bay Trotter) 



I 

 Chestnut d 

 (From Black) 



I 



Gray cf 



(From Gray) 



I 



Gray ? 



(From Gray) 



Gray i 

 (By Bay'Trotter) 



Red Eoan i 

 (By Red Roan 

 Trotter) 



1 



Dun i 



black points 



(By Bay Trotter) 



Journ. of Gen. ii 



