EXAMINATIONS IN HORTICULTURE, 1914. 



87 



2. Where the hybrids cross with the normal (the most hkely 

 thing to happen) : 



normals and hybrids being produced in equal proportions. Besides 

 these there are numerous normals breeding true, so that the proportion 

 of hybrids to normals will diminish in succeeding generations. They 

 could be eliminated by breeding from individuals, but as this is not 

 done the hybrid type persists and there is always the possibility 

 (although a remote one) of a rogue being thrown off, even without 

 the possible occasional variation that is usually supposed to account 

 for the production of these monstrous forms, and quite apart from 

 the physical environment of the plants grown for seed. 



NN c? X Nr ^ 



NN ^ 

 (normal) 



Nr ^ 

 (hybrid) 



