LUTHER BURBANK 



improved varieties of the ground cherry could be 

 developed. 



The lack of success of my hybridizing experi- 

 ments should not be considered as by any means 

 definitive. My final success in hybridizing two 

 species of this particular family after unsuccessful 

 experiments extending over a quarter of a century 

 will be recalled in connection with the story of 

 the development of the Sunberry. There is every 

 reason to suppose that experiments systematically 

 carried out would result in finding different mem- 

 bers of the ground cherry tribe that could be 

 hybridized. 



And the prospect of producing a really notable 

 fruit from such a union a fruit not unworthy of 

 a relative of the potato, tomato, and sunberry 

 seems particularly good. 



IMPROVING THE PASSION FLOWER FOR ITS FRUIT 



There is another vine, known everywhere by 

 name at least, and famed for its flowers, that has 

 fruit possibilities that have been almost totally 

 neglected. This is the celebrated Passion Flower, 

 a plant represented by a few species of tropical 

 and sub-tropical habitat, of which two at least 

 wander as far north as the southern portion of the 

 United States. 



The name Passion Flower was given to these 

 plants by the early Spanish missionaries, because 



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