70 



THE MENDEL JOURNAL 



a little more. We have thus eliminated twelve of the 

 exceptions, and only P^7^rim's Way and Stymie (a bad 

 selling plater), by St. Frusquin out of Mimi, remain. 

 One of the standard tests of Mendelian segregation 

 is the behaviour of impure dominants or, in my present 

 terminology, intermediates, when bred inter se. As a 

 fair representative sample of intermediates, the fol- 

 lowing sires have been taken, viz. : Gallinule and his 

 half-brother Pioneer, Orviefo and Laveno (own bro- 

 thers), Ladas, Ayrshire, Orme, Enthusiast, Hackler, 

 Raehurn, Eager, Amphion, Despair, and Grey Leg. 

 Here are the results of the matings of these fourteen 

 horses with mares of various compositions as deduced 

 by their performances : — 



TABLE X. 



The calculated result for PR sires mated with PP 

 mares is sprinters and intermediates in equal num- 

 bers. The forty stayers which appear here are 

 obviously the consequence of a percentage of the 

 mares in this mating having an PR composition, but 

 carrying the inhibitory factor I. The presence of the 



