. The book of wheat : an economic history and practical manual of the wheat industry. ral kinds of theless common wheats, such as Polish wheat, spelt and durumwheat, which have very marked characteristics, and whichhave perhaps not migrated so widely. In si)ite of some con-fusion in names, it is generally possil)le to determine to which THE WHEAT GRAIN AND PLANT 9 class they belong. Some of the most common and widely usedclassifications are those based on time of sowing, as spring andwinter wheat; on fiimness of structure of the grain, as hardand soft; on the products for which they are used,
. The book of wheat : an economic history and practical manual of the wheat industry. ral kinds of theless common wheats, such as Polish wheat, spelt and durumwheat, which have very marked characteristics, and whichhave perhaps not migrated so widely. In si)ite of some con-fusion in names, it is generally possil)le to determine to which THE WHEAT GRAIN AND PLANT 9 class they belong. Some of the most common and widely usedclassifications are those based on time of sowing, as spring andwinter wheat; on fiimness of structure of the grain, as hardand soft; on the products for which they are used, as breadand macaroni wheats; and on the color of the seed, as redand white. As will later be shown, wheat adapts itself to newenvironments so that any one of these classes may be trans-formed into any other, and as wheat is raised so widely as toembrace practically every kind of environment, these classesgrade into each other so imperceptibly that even an expert canhardly determine to which class a certain wheat may approximate division has, however, been made. Mr. M. WHEAT DISTRICTSSOFT semi-hardLI] southern |\ ni HARD-SPRINGLAS\ ^.71 HARD-WINTER Vi^« DURUM L^ IRRIGATED DISTRIBUTION OF V^ITEAT VARIETIES IN THE UNITED STATES Carleton, cerealist of the United States department of agri-culture, has divided the wheat grown in the United States intoeight classes, and has shown the distribution of these classesby districts in the accompanying map. On the north Atlantic coast is the soft wheat district, southof the Great Lakes the semi-hard district, and south of thesetwo districts is the southern district. The Red river valley is 1 U. S. Dept. Agr., Div. Veg. Phys. & Path., Bui. 24. 10 THE BOOK OP WHEAT. the center of hard spring wheat, Kansas of hard winter wheatand north central Texas of durum wheats. White wheat israised on the Pacific coast. The center of red wheat, notshown in this division, is from Kansas to the Red river still more general classificati
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