2IO 



POPULAR SCIENCE MONTHLY. 



From this cross many varieties were developed having all the colors 

 known in beans. 



The results of selection are often so simple as to form a mathe- 

 matical rule, as in the case of Mendel's peas, which holds good with 

 the tribe of peas (Pisum), but not generally with others so far experi- 

 mented on. At other times they are so complicated that to follow 

 them requires the highest skill, or may be utterly impossible. 



A rubus (R. cratcegifolius) from Siberia has fruit the size of a large 

 half pea, brownish, seedy and tasteless. Hybridizing with the Cali- 

 fornia blackberry (R. 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 Rubus. 



y Stems of Blackberry-Raspberry Hybrids. 



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 strawberry. At 

 last, however, the plants send up canes three to five feet high bearing 

 panicles of flowers more profuse in number than those on either parent. 

 After flowering the plant never produces a berry, the fruit forming 

 a small knob, with no effort at maturity. 



In the hybrid of the strawberry and raspberry, the resultant plants 

 bore three or four times as many flowers as the raspberry, seven or eight 

 times as many as the strawberry. 



Tendencies strong in the parent, even though for a time latent, 



