LUTHER BURBANK 



All the seeds of these hybrids were carefully 

 saved and planted. The seedlings were grafted on 

 older trees, and a few seasons later still better ones 

 were obtained; plants bearing larger fruits and 

 many of them showing the tendency to abandon 

 the stone. 



The first generation hybrid seedlings of this 

 type, which were quite numerous, had mostly the 

 French prune for the pistillate parent. A good 

 many, however, were from the reciprocal cross. 



Of the latter, the crooked thorny seedlings 

 which indicated that they were not crossed, or had 

 reverted to the wild type, were generally destroyed 

 even if they bore stoneless fruit. Those which 

 showed the French prune or ordinary plum type 

 were grafted into older trees to bear. 



All the seedlings from the cross of the sans 

 noyau pollen upon the French prune were grafted 

 and fruited even though many of them exhibited 

 the thorny, dwarf, ill-shape of the wild parent. 



After the first generation the seeds of all were 

 mixed, as there seemed no object in keeping them 

 separate. For two or three generations there were 

 all sorts of trees, the greater tendency being 

 towards the bullace, which, being a wild type, 

 would naturally be expected to have its characters 

 more thoroughly fixed. 



In the first generation some plums were ob- 



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