A. H. Sturtevant 47 



horses seen on the streets do not show dappling, but it is possible that 

 it would show on most of them at the time they are shedding their 

 coats. This whole question is one which, can be settled only by further 

 investigation. 



In my former paper I suggested (p. 215) that perhaps all horses 

 carrying the roan factor are roan, the type of roan, or the ground 

 colour, depending upon the colour the horse would have been if it 

 had not had that factor. Wilson bad already made the same suggestion, 

 as I now find, but he has givgn little more evidence on the subject than 

 I did. I have written to a good many breeders of Trotters, in order 

 to try and get information which would help out on this point, but 

 have not much to offer as yet. What little I have, however, is not 

 encouraging. In my tables of sires homozygous for the bay factor 

 (see former paper), and therefore producing no black foals, were two 

 roans. Jay Bird and Margrave. I am informed that both these stallions 

 were bay roans, and that Jay Bird's roan foals are also bay or red roans. 

 Margrave likewise has some bay roan foals and a full brother of the 

 same colour. This is according to expectation, but I am also informed 

 that Margrave has at least one blue roan colt. Moreover, his former 

 owner, who now owns the full brother mentioned above, writes me that 

 their dam, Spanish Maiden, was a blue roan. Not only did this mare 

 produce a supposed BB colt, but she was also the daughter of a BB 

 stallion, Happy Medium. Margrave has 65 non-black foals and Happy 

 Medium has 69, neither being credited with a single black, though 

 eleven of Happy Medium's bays and browns are from black mares, so 

 that it is very improbable that both should in reality be Bb animaLs. 

 Either Spanish Maiden and probably the Margrave colt are not blue 

 roans, or blue roans can carry the B factor. 



Wilson's tables give some information not brought out elsewhere, 

 so I shall take the liberty of reproducing them, in part. He considers 

 iron gray as a kind of roan. Of course his records may use that term 

 in a different sense from that in which American horsemen do, but 

 unless that is true iron gray is not a roan at all, but merely a young 

 gray. We, in America, mean by that term a very dark gray, which 

 the casual observer might mistake for a roan, but which later develops 

 into the ordinary dapple gray, and, still later, into white with black hairs 

 in the mane and tail, and on the feet. It is, moreover, the invariable 

 colour of a young gray, so far as I know. Wilson classifies these iron 

 grays separately but has only a few of them, and I shall omit them 

 because of my doubt as to their real position — a doubt which his data 



