LUTHER BURBANK 



vulpina or cordifolia — in fact I have worked more 

 or less with nearly or quite all the North Amer- 

 ican species and many of the hybrids produced 

 by Mr. Munson and others. 



Seeds of the tuberous grape of Mexico have 

 been sent me several times. It seems to require 

 a thoroughly well-drained soil and a very warm 

 climate. 



The first two lots of seeds received were fail- 

 ures on account of being placed in irrigated soil 

 which was not suitable to them. 



Some of the third lot of seeds were placed in 

 sandy, well-drained soil, and made large vigorous 

 vines the first season. They somewhat resemble 

 the Muscat of Alexandria in foliage and growth 

 and have rather large, sweet, potato-like roots. 

 However, our winter climate did not suit them 

 and these also died, so I have made no further 

 attempt at raising them. 



These Mexican tuberous grapes are said to 

 produce a fine fruit in large clusters, much re- 

 sembling the Muscat of Alexandria. 



Variations in Seedlings of a Bud-Sport 



My constant effort to take advantage of any 

 disturbance in the heredity of a species or variety 

 is justified strikingly in working with the grape. 



The best seedlings which I have ever produced 

 were from the grape called Pierce or Isabella 



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