64 THE MENDEL JOURNAL 



mares derived an R factor from their sires which their 

 sex inhibited, and a P factor from their dams, which 

 is manifested as the somatic character. They are 

 therefore really PR in composition, as we expect, but 

 the R factor is inhibited by the sex inhibiting factor, 

 and they therefore behave as though they were PP 

 in somatic composition and were sprinters. These 

 forty fillies, however, do not comprise the whole of 

 the sex limited offspring of their sires. The balance 

 is to be found in those mares which, through failure 

 to stay the minimum distance of five furlongs, did not 

 win after two years of age. Many were unable to win 

 at two, and others never appeared in public. 



In regard to the appearance of the sixty-one 

 sprinting colts, certain circumstances call for con- 

 sideration. Twenty-five were unlucky not to win at 

 eight furlongs or over,* six at least were roarers, 

 one broke blood vessels, and another, Longy, by 

 Trenton out of Saintly, became extremely obstinate 

 and mulish after two years of age. The race he won 

 at six furlongs was in the nature of a fluke, and much 

 against his will. It was not so much stamina that he 

 lacked as a willing disposition. Thus, taking into 

 account the five hundred and forty matings which 

 produced colts, there are twenty-eight apparent 

 exceptions to the rule that RR x PR and RR x PP 

 should give RR and PR solely. Having regard to 

 the fact that the disposition of the skeletal levers 



* Of these twenty-five, fourteen won at seven furlongs, and were 

 placed at longer distances, and eleven \\on at six furlongs, and were placed 

 at eight furlongs, in good company. Some of the twenty-five were merely 

 beaten by short heads over a greater distance than seven furlongs. 



