POLYGAMOUS FACTORS 87 



scale than black. At the same time grey sires carrying 

 recessives low in the scale should leave the intermediate 

 colours in addition to grey and that produced by their 

 own recessive. The chestnut factor, for instance, in a 

 grey carrying chestnut should combine not only with 

 chestnut but also with black and bay, and the foals 

 concerned should be blacks and bays. In the following 

 table, which gives the colours of the progeny of 18 

 grey sires, it will be seen that, in the first five cases, 

 no colour is found below bay, in the next, black is found, 

 and, in the remainder, chestnut. The absence of blacks 

 in some of these last cases is to be accounted for by the 

 fact that unless in very early days the breed to which 

 the sires belonged, with the exception of Sir John Fal- 

 staff's, contained very few blacks. In all these cases 

 there were no dun matings or matings which could 

 have produced duns. The sires were all Thoroughbreds 

 excepting those against whose names the letter (S) 

 is placed, which were Shires. The date against each 

 sire's name is approximately that of his birth. 



