290 



INDEX 



Grain smuts, prevention of, 282. 



Grasshoppers, 163. 



Green cuttings, 209, (lab.), 284. 



care in making, 210. 



kinds of, 211. 



leaf surface of, 210. 



of herbaceous plants, 211. 



of woody plants, 212. 

 Greenhouse, 201. 



heating of, 202. 



Greenhouse plants, rest for, 105. 

 Growing point, 43. 

 Growth, 7. 



cessation of, 104. 



checking of, 85. 



of roots, 64. 



pruning for, 258. 



retarded, 134. 



after transplanting, 246. 

 Growth current, obstructing, 260. 

 Growth rings, formation of, 47. 

 Guard-cells, 42. 



Hardiness, 5. 



relation to leaf size, 77. 



relation to maturity, 106. 

 Head, in fruit-trees, 256. 



pruning for open, 254. 

 Healing of wounds, 48. 

 Health, 6. 

 Heat, effect on evergreens, 110. 



relation to transpiration, 109. 

 Heaving, 118. 

 Hedge shears, 264. 

 Heel, cuttings, with, 206. 

 Heeling-in, 237, (lab.), 284. 

 Hellebore, 157 ; keeping of, 159. 

 Herbaceous plants, green cuttings 

 of, 211. 



method of side-grafting, 224. 



packing for transportation, 234. 

 Heredity, 8, 113. 

 Hermaphrodite, 94. 

 Hotbed, 200, (lab.), 283. 



ventilation of, 62. 

 Hot water, as an insecticide, 



162. 



Humidity, controlling of, 204. 

 Hybrids, 12. 



Hydrocyanic acid gas, 161. 

 Hypocotyl, 25, 28. 



Ice, destruction of plants by, 118. 

 Implements, for pruning, 262. 

 Improvement of plants, 265. 

 Individuals, in relation to species, 9. 

 Insecticides, 156. 



application of, 164. 



for sucking insects, 172. 



use of, 167. 



Insect injury, avoiding by grafting, 

 215. 



prevention of, 154. 

 Insects, burrowing, 168. 



classes of, 167. 



control of, 154, 155, 171. 



depredation by numbers of, 162. 



sucking, 167, 171. 



useful, 154. 

 Internodes, 72. 



elongation of cells in, 139. 



length of, 73. 

 Irrigation, 136. 



Kerosene, 160. 



emulsion (lab.), 282. 



Labeling of crosses, 272. 

 Laboratory work, 275. 

 Latent buds, 80. 

 Lateral buds, 79. 



Layers, mutilating to encourage 

 rooting, 192. 



propagation by, 191. 

 Lead arsenate, 156. 

 Leaf-buds, 81. 



vigor of, 83. 



Leaf-cuttings, 212, (lab.), 284. 

 Leaf development, 76. 

 Leaf-eaters, 168. 

 Leaf-miners, 170. 

 Leaf surface, of cuttings, 210. 

 Leaves, function, 75. 



life of, 78. 



manurial value of, 78. 



number of, 76. 



size of, 77. 



structure, 75. 



