xviii. LIST OF ILLUSTRATIONS 



Page 



21. Illinois Soil Experiment 60 



22. Illinois Soil Experiment 61 



23. Rothamstead Experiments 63 



24. Soil Bacteria - 60 



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 



Ntfrth 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 - - 98 



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 - 111 



39. Types of Cultivators 113 



40. Types of Disc Harrow - 115 



41. Types of Harrows 116 



