Plant-breeding; comments on the experiments of Nilsson and Burbank . recorded so as toleave no doubt concerning the real nature of the mutation. The double variety of the corn-marigold (Chr^san-themum segetum) arose in my garden in a culture in whichI was increasing the number of the ray-florets by contin-uous selection. During four years I had succeeded in in-creasing this number to about sixty on each head, startingfrom the cultivated variety, with an average of the ray-florets, however, belonged to the outer rows ofthe heads, as in the original variety. At once a plant arosew
Plant-breeding; comments on the experiments of Nilsson and Burbank . recorded so as toleave no doubt concerning the real nature of the mutation. The double variety of the corn-marigold (Chr^san-themum segetum) arose in my garden in a culture in whichI was increasing the number of the ray-florets by contin-uous selection. During four years I had succeeded in in-creasing this number to about sixty on each head, startingfrom the cultivated variety, with an average of the ray-florets, however, belonged to the outer rows ofthe heads, as in the original variety. At once a plant arosewhich produced some few ligulate florets in the midst of thedisc. This indicated the production of a double the seeds of this mutating individual were sown, thenext year, they yielded a uniformly double group; and fromthis time the new variety remained constant. The Dracocephalum moldavicum is an annual garden-plant belonging to a genus in which Morren has described ^i. Fig. 2. A. The toadflax (Lhiaria vulgaris). E, C. Its peloric variety. jieloric flower on an ordinary specimen. s; 5. 5 hj o ,?? c [2 ri ? p m ro n|| ^ ^^ K- o ^ c ^ D- ?s ^ -1 P ^ o ^ ^ 1^2 o S ? ?-n fC -1 ^ Ij en P- M Q p -; 9 3 Jq
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