XXVI CLASSIFIED LIST OF ILLUSTRATIONS 



PAGE 



33. Ice crystals and soil granulation. Fig. 33 110 



34. Clay soil plowed wet. Fig. 35 112 



35. Soil in good tilth. Fig. 38 126 



36. A mulch of stone. Fig. 63 201 



37. Example of clean cultivation. Fig. 65 206 



38. Flume for measuring miner's inches. Fig. 73 227 



39. Canvas dam. Fig. 74 232 



40. Poorly drained clay land. Fig. 76 238 



41. Section of tile drain in clay soil. Fig. 77 241 



42. Soil granulated by drainage. Fig. 79 246 



43. System of surface drains. Fig. 80 249 



44. Construction of ditch for tile drain. Fig. 81 251 



45. Laying tile by use of tile hook. Fig. 82 252 



46. Laying tile by hand. Fig. 83 253 



47. Types of drain tile. Fig. 88 257 



48. Ditching machine in operation. Fig. 91 260 



49. Ditch cut by machine. Fig. 92 261 



50. Poorly constructed outlet of drain. Fig. 93 262 



51. Result of poorly constructed outlet. Fig. 94 264 



52. Well-constructed outlet. Fig. 95 265 



53. Filling ditch by use of team. Fig. 96 266 



54. Waste of manure by leaching. Fig. 101 302 



55. Alkali spot. Fig. 102 308 



56. Bromus inermis on alkali soil. Fig. 104 317 



57. Wates of manure. Fig. 106 364 



58. Manure piled in the field. Fig. 107 382 



59. Alfalfa root tubercles. Fig. 114 424 



60. Heavy sod freshly broken. Fig. 120 445 



61. Erosion on gravelly hillside. Fig. 150 491 



62. Terraces used in southern farming. Fig. 151 492 



63. Side-hill ditches to prevent erosion. Fig. 152 493 



64. Plant roots and erosion. Fig. 153 495 



65. Celery and lettuce on muck soil. Fig. 154 498 



66. Farm scene on light sand soil. Fig. 155 500 



67. Farm scene on limestone loam soil. Fig. 156 502 



68. Influence of crop rotation on growth of corn. Fig. 157 507 



69. Diagram. Relative size of textural groups. Fig. 19 72 



70. Diagram. Ideal arrangement of soil particles. Fig. 26 89 



71. Diagram. Forms and proportion of soil water. Fig. 43 141 



72. Diagram. Distribution of soil water. Fig. 45 147 



73. Diagram. Adjustment of capillary soil water. Fig. 52 171 



74. Diagram. Relation of root-hairs to soil water. Fig. 53 174 



75. Diagram. Structure of mulched and unmulched soil. Fig. 62. . 199 



76. Diagram. Water table in tile-drained land. Fig. 78 245 



