Mr. Burbank at Work 



Mr. Burbank is here selecting among boxes of second-gen- 

 eration thornless blackberry hybrids. Some of these speci- 

 mens are a cross between lh". thornless blackberry and the white 

 blackberry; others between the thornless and the Himalaya 

 blackberry. Through these experiments Mr. Burbank 

 hopes to rid all of our best varieties of black- 

 berries of their thorns. 



