74 THE MENDEL JOURNAL 



sprinters, we have sixty-five sprinters, fourteen 

 intermediates, and one pseudo-stayer, to which I 

 shall refer presently. 



In the mating of PP sires (sprinters) with PR 

 mares (intermediates) we expect in the offspring, if 

 there are no complications due to inhibiting factors 

 in the mares, equal numbers of sprinters and inter- 

 mediates. The result, as the Table XL shows, is to give 

 nine sprinters and fifteen intermediates. This dis- 

 crepancy in the proportions may be due to the small- 

 ness of the numbers or to some of the mares being 

 really RR in composition but carrying an inhibiting 

 factor. Coming next to the mating of sprinting sires 

 PP with staying mares, the number of the offspring 

 is extremely small, and this gives an exaggerated value 

 to the two sprinters from the staying mares Sacristy 

 and Carnatum. Sacristy, although mated repeatedly 

 with Marco and other horses of intermediate com- 

 position, has never bred anything which could stay. 

 In these circumstances she must really have been an 

 intermediate PR. It is the same with Carnatum, 

 for she, too, has never bred a winner at a greater 

 distance than five furlongs. 



In dealing with the theoretical considerations 

 arising from the facts, we must remember, as already 

 stated, that the border line between intermediates 

 and stayers is not clearly enough defined. Twelve 

 furlongs does not afford a sufficiently severe test. 

 But, even so, a scrutiny shows that two of the five 

 presumptive stayers in the fourth column of Table XL, 

 produced as the offspring of sprinting sires mated with 



