CONTENTS XV 



SECTION PAGE 



149. Conservation of Moisture Tilling ..... 207 



150. Irrigation and Underdrainage 210 



151. Soil Air 212 



152. Plant Food I ..." 213 



153. Humus 215 



154. Enriching the Soil 216 



155. Green Manures . . . . . . . . .217 



156. Barnyard Manure 218 



157. Renovation of Worn-out Soils 220 



158. The Liming of the Soil 220 



159. Commercial Fertilizers 222 



160. Use of Commercial Fertilizers 223 



161. Home-mixed Fertilizers 224 



162. Fertilizers for Garden Crops 225 



163. Plant Roots 226 



164. Plant Stems . 227 



165. Leaves . ". 228 



166. Buds . . .. 230 



167. Flowers .231 



168. Fruits and Seeds 232 



169. Flavoring Extracts and Perfumes . . . . . 234 



170. Plant Food II ,'" . . 235 



171. The Propagation and Breeding of Plants . . ' . .236 



172. Plants Forestry 237 



173. Lower Forms of Plant Life Bacteria, Molds, and Mildew 238 



174. Fermentation Yeasts . . . * .-. . . 240 



175. Alcohol for Purposes of Energy . . . * . . . 241 



176. Lower Forms of Plant Life Fungi, Rusts, Mushrooms, 



etc .'/.- . .243 



177. Protozoa and Amoebae ........ 244 



178. Insects and the Smaller Animals 245 



179. The Stings of Insects 246 



180. Animal Life Distribution 247 



181. The Invertebrates 247 



182. Animal Life Fishes, Animals, and Birds . . . . 248 



183. Animal Life Man 249 



184. The Life Processes . ' 250 



185. The Bones, or Framework 251 



186. The Lever and its Advantage 252 



