Plant-breeding; comments on the experiments of Nilsson and Burbank . ale corollas. Stocks havegrayish, brown, or bluish seeds according to the color of theirpetals. Among the lupins the red and blue forms may oftenbe distinguished by their dark seeds, but the white varietyhas wliite seeds (Lupinus angustifohus). White vetcheshave, as a rule, yellow or greenish seeds, in contrast to thedark seeds of the common species. The true opium poppyhas white flowers and pale seeds, and many other gardenvarieties of this plant differ in their flowers and seeds in amore or less corresponding degree. In all
Plant-breeding; comments on the experiments of Nilsson and Burbank . ale corollas. Stocks havegrayish, brown, or bluish seeds according to the color of theirpetals. Among the lupins the red and blue forms may oftenbe distinguished by their dark seeds, but the white varietyhas wliite seeds (Lupinus angustifohus). White vetcheshave, as a rule, yellow or greenish seeds, in contrast to thedark seeds of the common species. The true opium poppyhas white flowers and pale seeds, and many other gardenvarieties of this plant differ in their flowers and seeds in amore or less corresponding degree. In all such cases there can be no doubt, that the coinci-dence is a real correlation, and that the cause, which darkensthe flowers is the same as that wliich is active in the seeds. Berries often show the same correlation to the a species has red or blue corollas combined with darkberries, its white variety will often show pale or even whitefruits. One of the most interesting instances of this rule isthe pale variety of the belladonna, a very poisonous Fig- 75- The long-leaved Veronica {Venmicalongijolia). 245 246 PLANT-BREEDING which grows in many forests of Germany. It has brownishflowers and large and shiny black fruit, the color consist-ing of two factors, a yellow and a red one. A variety of thisspecies was discovered by Schiitz in a wood in the neighbor-hood of Calw in Wurtemberg about the middle of the lastcentury (1851; cf. Hoffman, Sp. et \ar., p. 87). It has palegreenish flowers and bright yellow berries. It comes trueto its character from seed, and is often cultivated in botani-cal gardens. The red dye or anthocyanin, which darkensthe corollas of the species and is concentrated in the fruitto a degree that makes it black, is absent in both organsin the variety, the yellow not being affected by the the red dye is the same color in both organs,and as soon as it became latent by the production of the newform, it disappeared simultaneously f
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