LUTHER BURBANK 



the most promising of these to rows about 12 feet 

 apart, the individual plants being from one to two 

 feet apart in the rows, according to the variety. 



Like most other cultivated fruits, grapes do 

 not come true from the seed. Among American 

 grapes, if seeds from a vine bearing black fruit 

 are planted, about 99 out of 100 black-fruited 

 seedlings may be expected. With red grapes 

 about the same proportion will follow the parent 

 color. But from a white grape probably less than 

 one-fourth will come white. 



With the European grape, Vitis vinifera, the 

 most variable and commercially the most impor- 

 tant species in the world, the proportion would be 

 wholly different in most cases. Planting a red 

 grape one may expect half red or half black, the 

 tendency being slightly more toward red or black 

 grapes than white, but the proportions varying 

 indefinitely. 



Certain qualities of the inherent constitution 

 of the plant are markedly heritable. 



Thus the seeds from a strong-growing grape 

 vine are likely to produce strong-growing seed- 

 lings. Productive grapes will usually produce a 

 high proportion of productive seedlings. A grape 

 subject to mildew is almost certain to produce a 

 large proportion of seedlings subject to mildew. 



A variety having abnormally large leaves will 



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