232 LUTHER BURBANK 



another, from early spring until almost the on- 

 set of winter. 



As to other possibilities of blackberry develop- 

 ment, something was said in the earlier chapter 

 that described the development of the white 

 blackberry. But much remains to be told. 

 The chief development, however, through which 

 not merely new varieties but new species of ber- 

 ries have sprung from the amalgamated stock of 

 the forty-odd species of bramble fruit with which 

 I have experimented, have had their origin in 

 hybridizations that linked the blackberry with its 

 relative the raspberry. 



The account of the altogether notable results 

 that have arisen from this alliance is an integral 

 part of the story of the blackberry. But it may 

 be told to best advantage in connection with the 

 story of the raspberry in the succeeding chapter. 



The ihornless blackberry is an ac- 

 complished fact, and the value of 

 thornlessness in a berry-producing 

 vine is so obvious that the new 

 product will not fail to supplant 

 the old type of brier bush quite 

 rapidly and effectually. 



