xxvi LIST OF ILLUSTRATIONS 



FACING PAGE 



26. Sand Dunes Near Lake Michigan A Wind-formed Soil 



that is Valueless 28 



27. The Everglades of Florida A Soil Built Largely by the 



Decay of Plants 28 



28. A Unique "Soil" 29 



29. The "Particles" of the Above Soil 29 



30. The Three Chief Ingredients of Soils: Humus or De- 



caying Vegetation, Clay, and Sand ...... 30 



31. A. Clay Soil Cracking 30 



32. How Film Water is Prevented from Evaporating by a 



Soil Mulch 31 



33. Corn Leaves Curling in a Drought 31 



34. Tilling the Soil The Most Common, and the Most Im- 



portant Operation on the Farm 102 



35. Potatoes in Dire Need of Tillage 103 



36. Potatoes Luxuriating Under a Mulch of Loose, Dry 



Soil 103 



37. Water Held by a Coarse and by a Fine Soil . . . . 106 



38. A'Lumpy Soil 106 



39. A Perfect Soil Mulch . 107 



40. Where Troublesome Weeds are Wont to Congregate and 



to Multiply 107 



41. Plowing the Corn Field . 116 



42. Flat-furrow Plowing The Slice Completely Inverted . 117 



43. Clay Soil Plowed When Too Wet 117 



44. Ideal Plowing 124 



45. An Ideal Plow for Ordinary Work 125 



46. A Cheap and Rather Ineffective Wooden-beam Plow . 125 



47. Shiftless Plowing in North Florida 128 



48. Turning Under Thick Herbage with the Aid of a Chain 128 



49. The Appearance of Land After Fall Plowing ... 129 



50. The Appearance of the Same Land the Following Spring 129 



51. The Work of the Acme Harrow 144 



52. A Home-made Spike-tooth Harrow, in Two Sections . 145 



53. A Sulky Harrow 145 



54. A Spring-tooth Harrow 146 



55. The Work of a Spring-tooth Harrow 146 



56. "Sweeps" Attached to a Plow-stock, for "Laying By" 



Corn 147 



57. The Effect of Using the Above Tool for Cultivating a 



Cotton Field 147 



58. The Most Common Type of Deep-working Coulter-tooth 



Cultivator 158 



