ILLUSTRATIOXS. 



PLATES. 



Pasre. 



Fkontispiece. Map showing the distriljution by districts of the different nat- 

 ural groups of ^Yheat varieties in the United States. 



Plate I. Wheat field near jNIount Vernon, Va 12 



II. Fig. 1, Wheat fields of the Red River Valley near Grand Forks, 

 N. Dak. Fig. 2, Self-binders at ^\'oi-k near Grand Forks, 

 N. Dak 16 



III. Fig. 1, Field of wheat on "Tule" lands near Stockton, Cal. 



Fig. 2, Steam combined harvester-thresher harvesting on 

 "Tule" lands near Stockton, Cal 22 



IV. Fig. 1, Bags of wheat just harvested on the Bidwell estate, Chico, 



Cal. Fig. 2, Wheat field near Tehama, Cal 22 



V. Fig. 1, Harvesting with the combined harvester-thresher near 

 Walla Walla, AVash. Fig. 2, Wheat fields before and after 

 harvesting, near Walla AValla, Wash 24 



VI. Fig. 1, Combined harvester-thresher at work near Walla Walla, 

 Wash. Fig. 2, Harvesting with the wide-cut binder near 



Colfax, Wash 28 



VII. Spelts and Emkorns in exi^erimental plats at Garrett Park, Md. 34 

 VIII. Fig. 1, Group of Russian wheats in experimental plats at Garrett 

 Park, Md. Fig. 2, Experimental wheat plats at Garrett Park, 

 Md. , showing earliness of King's Jubilee 62 



IX. Hybrid wheats. Early Arcadian and Diamond Grit, shown by the 



side of the parent varieties 72 



X. A comjjosite cross by the Gartons, showing samples of the prog- 

 eny of the last cross 74 



TEXT FIGURES. 



Fig. 1. Diagram showing pedigree of Early Genesee Giant Wheat 71 



2. Diagram showing pedigree of one of the Gartons' hybrid wheats 74 



3. Diagram showing pedigree of one of the Gartons' hybrid wheats 75 



4. Diagram showing pedigree of one of Farrer's hybrid wheats 76 



5. Diagram showing hypothetical cross of wheat and spelt 76 



6 



