Index. 



281 



Hardiness, defined, 1:5; dependent 

 on degree of dormancy, 111. 



Healing of wounds, 55. 



Health defined, 13. 



Heat, excessive, how affecting 

 plants, 115. 



Hedge shears, 257. 



Heeling-in plants, 231. 



Hellebore powder, 159, 160. 



Hemp, broom rape of, 171. 



Herbaceous grafting, 200, 219. 



Herbaceous stems defined, 53. 



Heredity and variation, 16. 



Hermaphrodite flowers, 100. 



Hoarfrost, cause of, 126. 



Horizontal extent of roots, 75. 



Host (of parasites) defined, 21. 



Hotbed, the, 195. 



Hotbeds require care in ventilation, 

 69. 



Hot water,for destroying insects,163; 

 t reatment for grain smut, 173. 



Humidity, methods of controlling, 

 200. 



Hybrids and crosses defined, 20. 



Hydrocyanic gas, 162. 



Hydrogen, source of, in plants, 44. 



Hyphfe, 172. 



Hypocotyl, defined, 32; develops dif- 

 ferently in different species. 36; 

 roots start from, 35; seeds in which 

 it lengthens must be planted shal- 

 low, 36. 



Ice often destroys low plants, 124. 



Immature vs. ripe seeds, 105. 



Imperfect flowers, 100. 



Implements, for pruning, 255; for 

 t transplanting, 235, 236, 237. 



Improvement possible through 

 plant variability, 260. 



Individuals defined, 18. 



Injury by cold, methods of avert- 

 ing, 124. 



Insecticides, 157; apparatus for ap- 

 plying, 164; use of, 165. 



Insects, beneficial, 156; burrowing, 

 1<>7; destroying by poisons or caus- 

 tics, 157; eat ing- insects, 166; hand- 

 picking, 157; injurious, life history 

 of, 170; leaf-eating, 166; ravages, 

 17 



Insects, method of preventing, 156; 

 repelling, by means of offensive 

 odors, 157; root-eating, 166, 167; 

 sucking, 166, 170. 



Insects, trapping, 156. 



Internodes,defliied, 78; stem length- 

 ens by elongation of, 79; ultimate 

 length of, 80. 



Iron essential to formation of 

 chlorophyll, 45. 



Irrigation, 139. 



Kainit, 152. 



Kerosene, applied with water, 161; 

 as an insecticide, 161; emulsion, 

 161. 



Killing trees by girdling, 62. 



Knife, budding, 223; grafting, 213; 

 pruning, 255. 



Knowledge, application of, essen- 

 tial to success, 9. 



Lath screen for shading plants, 140. 



Leaf-buds, 86; comparative vigor 

 of, 89. 



Leaf cuttings, propagation by, 208. 



Leaf development,importance of,81. 



Leaf fall, time of, an index of wood 

 maturity, 111. 



Leaf-eating insects, 166. 



Leaf miners, 167, 168. 



Leaves, 81; are usually short-lived, 

 83; comparative size of, 83; func- 

 tion of, 81; manurial value of, 84. 



Leguminous plants enrich the soil 

 with nitrogen, 77, 150. 



Lenticels, 50. 



Lever shears, 257. 



Life, culture deals with, 12. 



Life, what is it? 12. 



Lifting large trees, 227. 



Lifting the plant, directions for, 227. 



Light does not hinder germination, 

 32. 



Light, unfavorable, how affecting 

 the plant, 140. 



Living beings, cellular structure of, 

 13. 



Localities most subject to untimely 

 frosts, 131. 



Locusts, 164. 



