20 



37. A primitive method of thrashing wheat. 



38. Modern thrashing outfit. 



39. Sacked wheat stored in the open. 



40. A Chicago grain elevator. 



41. A Canadian grain elevator. 



42. Grain elevator, Manchester, England. 



43. Wheat heads and straw, showing rust. 



44. Effect of rust on wheat grains. 



45. Shrinking of grains due to rust. 



46. Table of production in various countries. ' 



REFERENCES. 



1. The Cereals in America. By T. F. Hunt. 



2. The Book of Wheat. By P. T. Dondlinger. 



3. The Culture of Winter Wheat in the Eastern United States. U. S. Dept. Agr. 



Farmers' Bui. 596. 



4. Winter Wheat Varieties for the Eastern United States. U. S. Dept. Agr. Farmers' 



Bui. 616. 



5. Winter Wheat in the Great Plains Area. U. S. Dept. Agr. Bui. 595. 



6. Growing Hard Spring Wheat. U. S. Dept. Agr. Farmers' Bui. 678. 



7. Spring Wheat in the Great Plains Area. Relation of Cultural Methods to Pro- 



duction. U. S. Dept. Agr. Bui. 214. 



8. Varieties of Hard Spring Wheat. U. S. Dept. Agr. Farmers' Bui. 680. 



9. Wheat Experiments. Ohio Sta. Bui. 298. 



10. Insects Destructive to Grain and Grain Products Stored in Bins and Granaries. 



Kansas Station Circ. 47. 



11. The Change in Weight of Grain in Arid Regions During Storage. Utah Station 



Bui. 130. 



12. Chinch Bug. U. S. Dept. Agr. Farmer's Bui. 657. 



13. Hessian Fly. U. S. Dept. Agr. Farmers' Bui. 640. 



14. Statistics of Grain Crops. U. S. Dept. Agr. Yearbook 1916. 



15. Smuts of Wheat, Oats, Barley, and Corn. U. S. Dept. Agr. Farmers' Bui. 507. 



