Some Experiments of Luther Burbank 



to form a mathematical rule, as in the case of 

 Mendel's peas, which holds good with the tribe 

 of peas {Fisuni), but not generally with others so 

 far experimented on. At other times they are so 

 complicated that to follow them requires the 

 highest skill, or may be utterly impossible. 



A rubus (i^. cratoegifolius) from Siberia has 

 fruit the size of a large half pea, brownish, seedy 

 and tasteless. Hybridizing with the California 

 blackberry (i^. vitifolius), some of the hybrids 

 have the best qualities of both berries combined, 

 and a perfect balance of characters. Out of over 

 five thousand second generation hybrid seedlings, 

 every one is true to the seed. This refers to the 

 Primus blackberry, which is now fully as true a 

 species as any classified species of Rubiis. 



The raspberry has been hybridized with a 

 strawberry: the results were thornless plants with 

 trifoliate leaves looking like a strawberry plant and 

 sending out underground stolons like the straw- 

 berry. At last, however, the plants send up canes 

 three to five feet high bearing panicles of flowers 



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