

PURITY OF RACE. 23 



ences of the parents on their progeny are 

 readily observable in the hybrids of two 

 highly contrasted " varieties," and especially 

 where there are several young at a birth. 

 In a litter of hybrid dogs, some may at 

 maturity resemble the male and others the 

 female, while some may be intermediate. 

 These variations, in the respective potencies 

 of the sexes in reproduction, can hardly 

 be more clearly demonstrated than by the 

 photographs of white and black oat plants 

 and their hybrids, grown for the purpose 

 of determining whether oats are naturally 

 cross-fertilised (see plates, pp. 24, 25), by 

 Mr Thomas Jamieson, F.I.C., Director of 

 the Aberdeenshire Agricultural Research 

 Association. 



These very interesting and instructive 

 examples of variations in the respective 

 reproductive potency of the sexes suggest 

 a wide field for speculation on the pro- 

 cesses of reproduction ; but it is sufficient 

 for our present purpose that they, as well 

 as hybrid puppies, justify the inference that 

 individual characteristics of two parents are 

 not equally divided not always at least 

 in their offspring, and also the assumption 

 that where likeness to one parent pre- 

 ponderates, that individual has in similar 



