294 



Index. 



li'iingicides, 181 ; various, 183, 

 186. 



Fungous diseases, need of con- 

 sulting specialist in, 186. 



Gathering and storing of seeds, 

 106. 



Genera, how formed, 18. 



Generic name defined, 20. 



Genus, how formed, 18. 



Germinating power, duration of, 

 108. 



Germination defined, 24 ; depend- 

 ent on stage of maturity of 

 seeds, 106 ; hastened by com- 

 pacting soil, 28 ; hastened by 

 mutilating seed case, 30 ; has- 

 tened by soaking seeds, 29 ; in 

 water, 27 ; moisture essential 

 to, 25 ; not hindered by light 

 32 ; oxygen essential to, 26 

 promptness in, important, 28 

 requisites for, 28 ; retarded by 

 excess of water, 29 ; seed-case 

 in, 33 ; temperature at which, 

 takes place, 26 ; time required 

 for, 32 ; warmth essential to, 

 25 ; when completed, 25. 



Germinations, earlier, form more 

 Tigorous plantlets, 38. 



CJlrdling, killing trees by, 63. 



Glumes, 99. 



Gooseberry mlldeTr, 185. 



Gophers, damage from, 161. 



Gormands on fruit trees, 140. 



Graft, 220. 



Grafting, approach, 235. 222 ; 

 cion, 222 ; cleft, 227, 225 ; cord, 

 225 ; herbaceous, 229, 235 ; how 

 possible, 54 ; objects of, 221 ; 

 paper, 225 ; plants uniting by, 

 221 ; propagation by, 220 ; root, 

 222 ; side, 229 ; top, 227 ; 

 veneer, 230 ; wax, how made, 

 223 ; whip, 225. 



Grafts, whole root, 227. 



Gramineae, flowers of, 99. 



Grape mildew, 183. 



Grass family, flowers of, 99. 



Grasshoppers, 172. 



Greenhouse, 206 ; heating devices 

 for, 207. 



Growing point defined, 51. 



Growth by cell division, 15 ; 

 cutting back new, to promote 

 flowering, 265 ; decline of. 111 • 

 defined, 15 ; in diameter of 

 stems, 54 ; of roots in length, 

 71 ; pruning for, 264 ; retarded 

 by insufficient moisture in soil, 

 142 ; tardy starting of, after 

 transplanting, 252 ; water nec- 

 essary to, 45. 



Growth current, obstructing, to 

 promote flowering and fruiting, 

 266 ; restriction of, promotes 

 fruitfulness, 63. 



Guard cells, 50, 51. 



Hardiness defined, 13 ; dependent 

 on degree of dormancy, 114. 



Healing of wounds, 56. 



Health defined, 13. 



Heat, excessive, how affecting 

 plants, 118. 



Hedge shears, 268. 



Heeling-in plants, 242. 



Hellebore powder, 166, 167. 



Hemp, broom rape of, 180. 



Herbaceous grafting, 229, 233. 



Herbaceous stems defined, 53. 



Heredity and variation, 16. 



Hermaphrodite flowers, 102. 



Hoarfrost, cause of, 130. 



Horizontal extent of roots, 76. 



Host (of parasites) defined, 21. 



Hotbed, the, 205. 



Hotbeds require care in ventila- 

 tion, 70. 



Hot water, for destroying in- 

 sects, 171. 



Humidity, methods of controlling, 

 209. 



Hybrids and crosses defined, 20. 



Hydrocyanic acid gas, 169. 



Flydrogen, source of, in plants, 

 44. 



Hyphae, 181. 



Hypocotyl, defined, 32 ; develops 

 differently in different species. 

 36 ; roots start from, 35 ; seeds 

 in which it lengthens must be 

 planted shallow, 36. 



Ice often destroys low plants, 

 127. 



Immature vs. ripe seeds, 107. 



Imperfect flowers, 103. 



Implements, for pruning, 268 ; 

 for transplanting, 246. 247, 

 248. 



Improvement possible through 

 plant variability, 272. 



Individuals defined, 18. 



Injury by cold, methods of avert- 

 ing, 127. 



Insecticides, 163 ; apparatus for 

 applying, 172 ; use of, 174. 



Insects, beneficial, 162 ; bur- 

 rowing, 175 ; destroying by 

 poisons or caustics, 163 ; eat- 

 ing-insects, 174 : hand-picking. 

 163 ; injurious, life history of, 

 179 ; leaf-eating, 175 ; ravages, 

 method of preventing, 162 ; re- 

 pelling, by means of ofCensive 



