Plant-breeding; comments on the experiments of Nilsson and Burbank . is the clear, greenish, and juicy fruitflesh, exactly as in an ordinary plum. The amount of stonyremnants varies greatly along with the other hybrids are more stony, others less. The latter will bechosen, in order to be crossed with large, highly flavoredprunes, so as to obtain a superior quality, or they may becrossed with all other existing cultivated varieties in orderto transmit the lack of a stone to all of them, and so ulti-mately to replace all the present varieties by correspond-. K V,iEi. 191 192 PLAN
Plant-breeding; comments on the experiments of Nilsson and Burbank . is the clear, greenish, and juicy fruitflesh, exactly as in an ordinary plum. The amount of stonyremnants varies greatly along with the other hybrids are more stony, others less. The latter will bechosen, in order to be crossed with large, highly flavoredprunes, so as to obtain a superior quality, or they may becrossed with all other existing cultivated varieties in orderto transmit the lack of a stone to all of them, and so ulti-mately to replace all the present varieties by correspond-. K V,iEi. 191 192 PLANT-BREEDING ing stoneless ones, each of which will be appropriate for thethe same culture and use as one of the older types. Here,once more, the question arose, can the disappearance of thestone be the result of the hybridization of two or more ordi-nary varieties? Burbanks answer was a negative. He hadfollowed fjuite another way in procuring this astonishingresult. He had noted that about two centuries ago, inFrance, a prune bore the name of Prune sans was an indifferent variety, more a curiosity than athing of commercial value, since it produced only smallfruit. But Burbank at once realized all the possibihtieswhich this stoneless form offered. He was quite con\incedthat it needed only to be crossed with the best ordinarykinds to give a new and most attractive fruit. He pro-cured seed of this long-forgotten French prototype and sowedthem on his farm. By their first fruits he satisfied himselfof the correctness of the description of them, and of theirfitn
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