Some Experiments of Luther Burbank 



of perturbation or 'wabble/ and take advantage 

 of the 'wabbling' to guide the life forces into the 

 desired habits or channels. The first crossing is 



Primus^ the First Fixed Rubus Species 

 Artificially Produced. 



generally a step in the direction in which we are 

 going, but repeated crossing is often necessary and 

 judicious selection always necessary to secure val- 

 uable practical results. Crossing may give the 



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