212 



A. H. STURTEVANT. 



it will be best to take up the grays by families, and I will first 

 treat of those in which it is epistatic, and then of the one in which 

 it seems not to be. 



Most of the high-bred grays of to-day go back to Pilot, Jr., 

 through an unbroken line of grays. This horse was a gray, son 

 of a black sire and of a mare of untraced breeding whose color 

 I have been unable to find. The gray sires in the next table all 

 get their gray from him. This table includes all known foals 

 except chestnuts, these being omitted for the same reason as 

 in the last case. Since gray is an unpopular color it is safe to 

 say that nearly all these foals were from recessive (gg) mares. I 

 have so far found only one case of grays being mated together, 

 and, since the produce of that mating was never heard from after 

 racing, I know of no horse homozygous for the gray factor, G. 



The following sires are all sons of gray members of the Pilot, 

 Jr., family. Several of them have gray foals in this table, but 

 all of these are from gray mares. 



There can be little doubt that in the Pilot, Jr., family gray is 

 an ordinary dominant, and there are other families where it seems 

 to be, though there is not as much evidence. One of these goes 

 back to the mare Sontag Mohawk, and through her probably 

 to imported Messenger, the foundation of the breed of American 



