xviii. LIST OF ILLUSTRATIONS 



Page 



21. Illinois Soil Experiment ------- (30 



22. Illinois Soil Experiment ------- 61 



23. Rothamstead Experiments 63 



24. Soil Bacteria ----- 69 



25. Nodules on the Roots of Alfalfa ----- 72 



26. Bacteria in Relation to Soil Building - - 74 



27. Wheat Under Irrigation Near Strathmore, 



Alberta 79 



28. Hauling Alfalfa Grown Under Irrigation at 



Coaldale, Alberta 82 



29. Well Tilled Field of Potatoes ----- 85 



30. Sugar Beets Growing on Irrigated Land 



North of Brooks, Alberta - - - - - 87 



31. A View of a Portion of the Experimental 



Farm at Brandon - , - - ^ 90 



32. Winter Rye at Indian Head, Saskatchewan 92 



33. Flax in Bloom in Southern Saskatchewan 94 



34. Harvesting Corn at Brandon, Manitoba - 96 



35. Cutting Sweet Clover at Saskatoon, Saskatch- 



ewan ---- 93 



36. Sudan Grass at the Manitoba Agricultural 



College - - - 100 



36a. Harvesting Short Wheat with a Header in 



Southern Alberta - - - 102 



37. Types of Bottoms - - - - . . . 107 



37a. The Disc Plow - - - . . 108 



37b. Subsoil Attachment on Mouldboard Plow - 109 



37c. Types of Coulters - - 110 



38. The Plow and Plowing - - HI 



39. Types of Cultivators - - - 113 



40. Types of Disc Harrow - - 115 



41. Types of Harrows - - 116 



