LUTHER BURBANK 



ter-inch or at most a half -inch in diameter. Thus 

 placed, they will begin bearing in from two to 

 four years; whereas if placed upon the large 

 branches a much longer period would be required. 



By this method I have tested as many as 526 

 varieties by actual count at the same time upon a 

 single tree. 



Thus twenty thousand or more varieties may 

 be tested at once on a single acre. The same trees 

 may serve in this way over and over indefinitely. 



It would be well if fruit growets in each geo- 

 graphical section would raise and test new seed- 

 lings, and also introduce and experiment with 

 new varieties produced elsewhere, aiming always 

 to select those best adapted to the requirements 

 of the particular locality. In this way many lo- 

 calities where the apple cannot be grown today 

 might produce thriving orchards. 



Making Hardy Apples 



The apple is relatively hardy, but improve- 

 ment is still possible in the way of producing va- 

 rieties that will stand the excessive cold of our 

 northern winters. The work of crossing hardy 

 Russian apples and also the hardy American crab 

 with the better varieties of apples is now being 

 carried on quite extensively, especially in Iowa. 

 By this means some good varieties have been pro- 

 duced that are especially adapted' to withstand the 



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