COLOR IN THE AMERICAN HARNESS HORSE. 2O5 



roans are ran . forming something less than 10 per cent of the 



il mimlicr of roan- -eeii on the streets of New York, and nearly 



all nl' tho-e -eeii an- heav y draught horses, so that I feel sure they 



verv ran indeed among blooded trotters. The official record - 



dn ii": di-iingui-h between these three types of roans, but in 



the journal- it i- not ran to see a horse described as belonging 



to on.- ui" tin- two i..niinoiu-r .lasses, though I have never yet 



n in tin in a reien-n.-e i.. , ( chestnut roan. There are several 



ty|x-- ol dun-. Inn. in the list above, all are rare. 



In a lew lainilic- dun- -< . in in lx? dominant to bay, brown and. 



Ma. k. and out- v. 1 \\ith gray, but l>eyond this I have 



Iniind mulling aliout tin- color, l.a-tly there are a very few 



>poiird trmti-r-. luit ihe-e arc all poorly bred ones, with short 



and 1 have done nothing with them. 



I ha\c tried to-lm\\ Inn- that Hur-t's discovery of the domi- 

 nance nl la> andMouiii t nut holds good for the American 

 harm hoi -c, and th.c . and roan, or all other colors 

 containing Mai k, are al-o dominant to chestnut. In order to 

 avoid coiitu-ioii I -hall call tin- dominant factor for the presence 

 o| Mack Hurst's factor. Apparently all tn liters have the factor 

 l"i i In -unit, which I -hall represent by C. This factor is hypo- 

 -tati. in all the others here mentioned. 1 he factor next highest 

 in the -.ale i- thai for black, or Hur-i'- . //, its absence 

 In in;< //. \. \t higher is that for bay, B, its absence being b. 

 At the to|i -land the i^ray and roan factors, (/ and R. Now 

 nio-t horses have neither of these last two, and are therefore 

 \ .he-tnut will al\va\s be Cfili, but may have any com- 

 bination l the other la. tors and their absences, since they pro- 

 duce no vi-iMe eiieci in the al>-ence of Hur-t's factor. N-ll 

 Mack- are ( 7/// ; ' ; > or i //'.. -ince bay is epistatic to sc'lf black. 

 Ha\- have .me or two (">. //'.<, and B's. Gra\'s ha\'e C, II and 

 (/', and loan- have i '. // and 7^. Whether these last two mu-t 

 have />' or nm i not clear. I -hall discuss the three epi-iatic 

 color- more lullv and give my theory as to brown when I have 

 I'lVM-nu-d the evidence a- to Hurst's factor. 



The chief authoritic- for the statistics and color pedign .-- 

 given here ha\e ln-eii \\allae'- '^"ear liook of Trotting and 

 Pacing" and Walla. <'- "American Trolling Kegi-ier." l>ih of 

 which are oiticial record-. 



