LUTHER BURBANK 



ject, the principle that progress must be sought 

 through the careful selection of types that vary 

 in the direction of desired progress; and that in a 

 vast majority of cases such variation may be 

 brought about, and in a sense directed, through 

 hybridization. 



[END OF VOLUME VI.] 



The successful plant de- 

 veloper must be able to look 

 beneath the surface of his 

 plants to discover and utilize 

 the underlying harmonies. 



