Plant-breeding; comments on the experiments of Nilsson and Burbank . td2 rt ?3 a-fLtd tcJ> -1 T3. 119 120 PLANT-BREEDING mentioned is of the same nature as that observed at Svaloffor the other cereals, and described in our previous the varieties are to be considered as built up of quitenumerous elementary forms, each of which is essentiallyuniform and constant. The cross-polUnation must, ofcourse, obscure tliis fact to some extent, but cannot annilii-latc it. As soon as such an elementary form is sufficientlyisolated and multiplied so that its progeny may fertilize it-self exc
Plant-breeding; comments on the experiments of Nilsson and Burbank . td2 rt ?3 a-fLtd tcJ> -1 T3. 119 120 PLANT-BREEDING mentioned is of the same nature as that observed at Svaloffor the other cereals, and described in our previous the varieties are to be considered as built up of quitenumerous elementary forms, each of which is essentiallyuniform and constant. The cross-polUnation must, ofcourse, obscure tliis fact to some extent, but cannot annilii-latc it. As soon as such an elementary form is sufficientlyisolated and multiplied so that its progeny may fertilize it-self exclusively, a uniform and constant race will be will then be hmited to the smaller, Init unavoid-able changes, wliich climatic and environmental conditionswill always evoke, even in the most purely bred races. Thenature of these so-called fluctuations we shall soon have toconsider, but for selection they are only of secondary impor-tance. The princi]ile of selection at the Svalof Ex])erimentStation consists in the search for such elementary forms,and in their isolation and sub
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