ILLUSTRATIONS 



PAGE 



The Bonanza Harvester Frontispiece 



Development of Wheat Plant 3 



Distribution of Wheat Varieties 9 



Root System of Wheat Plant . 12 



Organs of Wheat Reproduction 14 



Coats of a Wheat Kernel . . 15 



Cross Section of Wheat Grain 16 



A Stool of Wheat 17 



Opening of Wheat Flowers 20 



Harvesting Minnesota Blue Stem Wheat 34 



Crossing as a Cause of Variation 38 



Diagram of Pedigree of Hybrid 42 



Durum Wheat Districts 48 



Wheat Plants from Good and Poor Seed 52 



Combined Steam Plow, Harrow and Seeder 60 



Typical Farm Wheat Drill 64 



A Modern Press and Disc Drill 67 



Typical Force Feed Broadcast Seeder 68 



Forms of Early Sickles and Scythes 79 



Early and Modern Cradles 80 



Gallic Header 81 



Wheat Header in Operation 82 



An Early English Reaper 85 



A Modern Self-Rake Reaper 86 



A Modern Self -Binding Harvester 87 



Section of a Modern Threshing Machine 98 



Combined Harvester and Thresher 104 



Typical Wheat Field Where Rotation is Followed ... 112 



Furrow Method of Irrigation 120 



Twenty Self -Binding Harvesters at Work 128 



Combined Grain and Fertilizer Drill 135 



Three Threshing Outfits at Work 156 



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