HOW MAY I DO IT, TOO;— GRAFTING 



shows a ready union of cion and tree but 

 separation follows under unusual stress, 

 drought, overbearing, lack of nourishment, 

 and so on. 



In another stage of usual variation where, 

 in crossing, the union is free, the seed of 

 superior germinating quality and produced 

 abundantly, the seedlings being normal with 

 ordinary amount of variability, the grafts 

 unite readily, thriving well ; sometimes better 

 than when grafted on their own stock. 



He says on this point: 



"Where the plants are very different, having 

 a different line of descent and consequently 

 different structure, there will be no hybridiza- 

 tion at all. From this we have every grada- 

 tion to a point where the individuals are very 

 closely alike, and here we also have scarcely 

 any variation at all in the progeny, a condition 

 which favors extinction. Again, in grafting, 

 we have every intergradation between total 

 inability to unite and absolutely perfect 

 blend." 



Along with all the work of grafting goes 

 constant selection, the constant choosing of 

 the best from the best. It might be somewhat 



265 



