INHERITANCE IN RACE HORSES 77 



always R R in gametic constitution. When chest- 

 nuts are therefore bred together, their foals should 

 be always chestnut. If bred with bays their foals 

 may be either all bays, or half chestnuts (R R) and 

 half bays (D R), as we have j ast seen. In the 

 former case, the result is due to the fact that the 

 bays mated with them are D D and in the latter 

 case because they are D R. 



To the (D D) class of bays and browns l^elong 

 " St. Simon," " St. Serf," " Galopin," " Ladas," 

 " Merry Hampton," and " Cabin Boy " ; to the 

 (D R) bay and brown class "Royal Hampton," 

 "Donovan," "St. Angelo," "Isinglass," " Orvieto," 

 "Ayrshire," " Florizel II.," "Pioneer,"" Isonomy," 

 "Melton," "Wisdom," "Rose Window," and " St. 

 Maclou." 



In the records of the "General Stud Book 

 of Race Horses," are found some exceptions 

 to the rule that chestnuts crossed with chestnuts 

 give chestnuts only, and that (D D) bays 

 always breed true. These apparent exceptions it is 

 worth while to consider. In reality they do not 

 exist, but are either misprints or errors of entry. 

 It is of course not only difficult, but sometimes im- 

 possible, to satisfactorily clear up erroneous entries. 

 But in most cases inquiry reveals them. 



If we turn to Volume XXI. of the Stud Book, 

 which was published six months ago, we find it 

 contains fifteen so-called exceptions to the rule that 

 chestnut parents have only chestnut foals, namely — 



