| | [The farm equipment--plants, soils, animals, tools, buildings] | Frontispiece
|
| | Figure | Facing Page |
| 1. | [Specimen plants for study] | 6 |
| 2. | [The first effort of a sprouting seed] | 7 |
| 3. | [Germinating seeds with roots] | 7 |
| 4. | [To show that plant roots take water from the soil] | 10 |
| 5. | [To show that plant roots take food from the soil] | 10 |
| 6. | [A radish root, from which the stored food has been
used to help produce a crop of seeds] | 11 |
| 7. | [A sweet-potato root producing new plants] | 11 |
| 8. | [Sweet-potato roots] | 14 |
| 9. | [Soy-bean roots] | 15 |
| 10. | [A plow stopped in the furrow, to show what it does to
the roots of plants when used for after-cultivation] | 18 |
| 11. | [A corn-plant ten days after planting the seed] | 19 |
| 12. | [To show where growth in length of the root takes place] | 22 |
| 13. | [Radish seeds sprouted on dark cloth] | 22 |
| 14. | [To show how water gets into the roots of plants] | 23 |
| 15. | [To show osmose] | 23 |
| 16. | [To show that roots need air] | 26 |
| 17. | [Comparison of fresh and boiled water] | 26 |
| 18. | [Comparison of moist sand and puddled clay] | 27 |
| 19. | [Comparing soils] | 32 |
| 20. | [Water-test of soils] | 33 |
| 21. | [To show what becomes of the water taken from the soil
by roots] | 40 |
| 22. | [Percolation experiment. To show the relative powers
of soils to take in water falling on the surface] | 41 |
| 23. | [Bottles used in place of the lamp chimneys in Figs.
22 and 24] | 44 |
| 24. | [Capillarity of soils. To show the relative powers of
soils to take water from below] | 44 |
| 25. | [Water-absorbing and water-holding powers of soils] | 45 |
| 26. | [Capillary tubes. To show how water rises in small
tubes or is drawn into small spaces] | 48 |
| 27. | [Capillary plates] | 48 |
| 28. | [A cone of soil to show capillarity] | 49 |
| 29. | [To show the relative amounts of film-moisture held
by coarse and fine soils] | 49 |
| 30. | [To show the effect of a soil mulch] | 56 |
| 31. | [Soil temperature experiment] | 57 |
| 32. | [Charts showing average temperature of a set of dry
and wet soils during a period of five days] | 60 |
| 33. | [To show the value of organic matter] | 61 |
| 34. | [Soy-bean roots, showing nodules or tubercles] | 64 |
| 35. | [Garden-pea roots, showing tubercles or nodules] | 65 |
| 36. | [To show that seeds need water for germination] | 72 |
| 37. | [To show that seeds need air for germination] | 72 |
| 38. | [To show that seeds need air for germination] | 73 |
| 39. | [A seed-tester: two plates and a moist cloth] | 80 |
| 40. | [A seed-tester: a plaster cast with cavities in the
surface for small seeds] | 80 |
| 41. | [Germinating corn-kernel and bean] | 81 |
| 42. | [To show how the bean-plant gets up] | 82 |
| 43. | [To show how the corn-plant gets out of the soil] | 82 |
| 44. | [To show the use of cotyledons] | 83 |
| 45. | [To show the use of the kernel to the young corn-plant] | 86 |
| 46. | [To show how deeply seeds should be planted] | 87 |
| 47. | [Operations of seed-planting] | 88 |
| 48. | [A collection of planting machines] | 89 |
| 49. | [Spading-fork and spade] | 92 |
| 50. | [A wood beam-plow] | 93 |
| 51. | [A slip-nose share and a slip-nose] | 96 |
| 52. | [A straight knife coulter] | 96 |
| 53. | [An iron beam-plow with rolling coulter and double
clevis] | 96 |
| 54. | [A rolling cutter-harrow] | 97 |
| 55. | [Spring-toothed harrows] | 97 |
| 56. | [Spike-toothed harrows] | 104 |
| 57. | [A coulter-toothed harrow] | 104 |
| 58. | [A plank harrow] | 105 |
| 59. | [To show transpiration] | 108 |
| 60. | [Amount of transpiration] | 109 |
| 61. | [To show that growing leaves contain starch] | 114 |
| 62. | [To show that starch disappears from the leaf when
the plant is placed in the dark] | 114 |
| 63. | [To show that sunlight is necessary for starch-making
by leaves] | 115 |
| 64. | [To show that chlorophyl is necessary for starch
formation in the leaf] | 115 |
| 65. | [To show the giving off of gas by leaves, and that
sunlight is necessary for it] | 118 |
| 66. | [Seedling radishes reaching for light] | 119 |
| 67. | [Elm leaves injured by the "imported elm-tree
leaf-beetle," a chewing insect] | 119 |
| 68. | [A horse-chestnut stem, showing leaves, buds, and
scars, where last year's leaves dropped off] | 128 |
| 69. | [An underground stem. Buds show distinctly] | 129 |
| 70. | [Flower of cherry] | 130 |
| 71. | [Flower of apple] | 130 |
| 72. | [Pistil and stamen of flowering raspberry] | 131 |
| 73. | [Flower of buttercup] | 131 |
| 74. | [A magnolia flower showing central column of pistils
and stamens] | 134 |
| 75. | [Flowers of squash] | 135 |
| 76. | [Flower of a lily] | 136 |
| 77. | [Bud and flower of jewel-weed or "touch-me-not"] | 137 |
| 78. | [Pistillate flower and perfect flower of strawberry] | 137 |
| 79. | [A crop of cowpeas] | 178 |
| 80. | [Red clover] | 179 |
| 81. | [Soy-beans in young orchard] | 182 |
| 82. | [A young alfalfa plant just coming into flower] | 183 |
| 83. | [Cross-sections of stone-drains] | 238 |
| 84. | [Cross-section of a pole-drain and of a tile-drain] | 238 |
| 85. | [A collection of drainage tools] | 239 |
| 86. | [A poorly laid tile-drain and a properly graded
tile-drain] | 239 |