LUTHER BURBANK 



It has also been found that in plant life where 

 there has been much crossing either naturally or 

 by intent in the past that most striking individual 

 differences appear. Some individual seedlings 

 among any lot of such crossbred plants (all of 

 which may have come from the seeds of a single 

 variety), will thrive when grafted on certain other 

 species or varieties even better than on their 

 own roots, while other individual varieties refuse 

 to combine or grow under any conditions; for 

 instances, the common French prune thrives better 

 on almond roots than on its own, the golden drop 

 plum will not live when grafted on the peach 

 while some of its nearest relatives, the common 

 French prune and others, grow, thrive and produce 

 fruit abundantly. It thus appears that artificially 

 produced varieties may acquire really specific 

 difference of a profound nature. 



THE MUTUAL INFLUENCE OF CION AND STOCK 



Leaving the solution of this problem to the 

 physiologist, however, let us turn to the specific 

 task in hand, and consider that very important 

 part of the plant experimenter's task that has to 

 do with the grafting of vegetable tissues. 



It is convenient to recall that the trunk or 

 branch upon which a twig is grafted is called the 

 stock, and that the transplanted twig itself is 

 spoken of as the cion. The practical methods of 



[150] 



