. The book of wheat : an economic history and practical manual of the wheat industry. n 1892 at the Minnesotaexperiment station under the direction of Prof. W. M. 1891 to 1896 experiments were made in Kansas withlight, common and heavy seed, and seed from selected light seed unifonnly gave a lower yield, but common seedgave the highest yield during three years. At the Minnesotastation from 1895 to 1898, No. 169, a wheat selected on prin-ciples similar to those of Hallett, gave an average yield bushels per acie, while during the same years the un- ^ Georgics I., lines
. The book of wheat : an economic history and practical manual of the wheat industry. n 1892 at the Minnesotaexperiment station under the direction of Prof. W. M. 1891 to 1896 experiments were made in Kansas withlight, common and heavy seed, and seed from selected light seed unifonnly gave a lower yield, but common seedgave the highest yield during three years. At the Minnesotastation from 1895 to 1898, No. 169, a wheat selected on prin-ciples similar to those of Hallett, gave an average yield bushels per acie, while during the same years the un- ^ Georgics I., lines 286-288. 2 Neb. Bui. 32, p. 91. » Kan. Buls. 20, 33, 40 and 59. 38 THE BOOK OF WHEAT selected parent sort yielded only bushels, an increase dur-ing four years of bushels per acre. In ten years nearly 25per cent in yield was gained.* Ninety-six tests of selected wheat seed during the years 1900to 1902 at the Canada experiment farms gave an average gainof about per cent in favor of selection. Principles ditfer-ing somewhat from those usually followed in selection were. CROSSING AS A CAUSE OP VARIATION: Yield in grain of 100 plants, showing greater variation in yield of hybrid thanof parents. Yield of hybrid shown oy x line. (After Hays.) utilized by Lyon.^ His selections were for quality rather thanquantity. He expeiimented with the smallest and lightest^ker-nels on account of their high nitrogen content. Heavy seedplanted at the rate of bushels per acre gave a greater yieldof wheat the first year than light seed sowed at the same heavy seed grown from the heavy wheat and lightfrom the light wheat, the difference in yield in 3 or 4 years wassmall. After the first year of the separation, the light seedgave much the greater amount of pioteids per acre. Lyonpoints out, however, that proteid nitrogen is no index to theamount of gluten, which is the better basis for is not yet decided whether selection should be for plants withlarge hea
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