Heat necessary for germination, 73. Hilling the crop, 169. Hilum, 77. Hoeing and soil water, 158. Hoes, 4. Horn shavings as fertilizer, 195. Horse manure, 176. losses when piled, 176. House plants, watering of, 51. How the bean gets up, 78. How the corn gets up, 79. Humus, 27, 38. influence on soil texture, 62. nitrogen in, 67. a source of nitrogen, 67. water-absorbing power of, 41. water-holding power of, 44. water-pumping power of, 43. Hydrogen in plants, 66. Hypocotyl, 78. Ice, work of, in making soils, 35. Insects, chewing, 117. how to combat, 116, 117. injure leaves, 116. sucking, 116. Insect pollination, 131. Inter-tillage, 164. Iodine, test for starch, 64. Iron in plants, 66. Jointer of plow, 95. value as a pulverizer, 95. Kainite, 199. Knowledge of flowers, value of, 134. Land plaster, 200. Laws of nature, 5. Leaf work, conditions necessary for, 114. interfered with, 115, 118. Leather as a fertilizer, 195. Leaves, 8, 108. digest food, 114. facts about, 108. functions of, 109. manufacture starch, 112. transpire water, 110. Legume family, 86. Legumes, definition of, 68. nitrogen fixers, 68, 186, 144. value as green manure plants, 144, 185. Leguminous plants, 68. Light necessary for leaf work, 114. Lily family, 86. Lime, 200. amount to use, 200. effect on sand, 200. effect on clay, 200. in soils, 149. its action on soils, 149, 200. sets free potash, 149. sources of, 171, 200. Lime stone soluble in water, 31. Loam, 28. Loamy soils, 28. London purple, 117. Loss of soil water, 53, 155. Lucern, 13. roots, 13. Magnesium in plants, 66. Maintenance of fertility, 150. Materials composing soils, 26. Mallow family, 86. Manures, barn, 171, 173. application of, 177. care of, 173. checking losses from, 176. effect on soil texture, 172. effect on soil water, 159. functions of, 171. losses from leaching, 173. losses from heating, 174. Many things the farmer deals with, 5. Marigold, 6. Marl, 201. Melon flower, 133. Miami sand, 28. Microscopic organisms, 5. Mixed fertilizers, 202. inflating the guarantee, 204. low grade, 204, 207. many brands, 202. valuation of, 205. Morning-glory, 129. Most important factor in the raising of crops, 151. Mould board of plow, 94. Muck, swamp, 30. Mulch, soil, 56. how made, 56. to save water, 56. Muriate of potash, 199. Mustard, family, 86. flower, 129, 130. Muskmelon soils, 161. Night shade family, 86. Nitrates, what they are, 146. availability of, 146, 193. solubility of, 146. Nitrate of soda, 193. nitrogen, 193. Nitric acid in soil, 146. Nitrification, 146. aided by plowing, 146. aided by lime, 146. conditions favorable to, 146.