Index. 



295 



Germination 



to, 26; promptness in, im- 

 portant, 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 vigorous plantlets, .38. 



Girdling, killing trees by. 63. 



Glumes, 99. 



Gooseberry mildew, 184. 



Gophers, damage from, 161. 



Gormands on fruit trees, 140. 



Graft, 219. 



Grafting, approach, 234, 221; 

 cion, 221; cleft, 226, 224; cord, 

 224; herbaceous, 228, 234; how 

 possible 54; objects of. 220; 

 paper, 224; plants uniting 

 by, 220; propagation by, 219;- 

 root, 221; side, 228; top, 226; 

 veneer, 229; wax, how made, 

 222; Whip, 224. 



Grafts, whole root, 226. 



Gramineae, flowers of, 99. 



Grape mildew, 182. 



Grass family flowers of, 99. 



Grasshoppers, 171. 



Greenhouse, 205; heating de- 

 vices for, 206. 



Growing point defined, 51. 



Growth by cell division, 



to 



15, 

 pro- 



decline 

 in di- 

 54; of 



cutting back new. 

 mote flowering, 264; 

 of, 111; defined, 15 

 ameter, of stems, 

 roots in length, 71; pruning 

 for, 263; retarded by insuffi- 

 cient moisture in soil. 142; 

 tardy starting of, after trans- 

 planting. 251; water neces- 

 sary to, 45. 



Growth current, obstructing, to 

 promote flowering and fruit- 

 ing, 265; restriction of, pro- 

 motes fruitfulness, 63. 



Guard cells, 50, 51. 



Hardiness defined, 13; depend- 

 ent on degree of dormancy, 

 114. 



Healing of wounds, 56. 



Health defined, 13. 



Heat, excessive, how affecting 

 plants 118. 



Hedge shears, 267. 



Heeling-in plants, 241. 



Hellebore powder, 166, 167. 



Hemp, broom rape of, 179. 



Herbaceous grafting, 228, 234. 



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, 204. 



Hotbeds require care in ven- 

 tilation, 70. 



Hot water, for destroying in- 

 sects, 170. 



Humidity, methods of con- 

 trolling, 208. 



Hybrids and crosses defined, 20. 



Hydrocyanic gas, 169. 



Hydrogen, source of, in plants, 

 44. 



Hyphae, 180. 



Hypocotyl, defined, 32; devel- 

 ops differently in different 

 species, 36; roots start from, 

 35; seeds in which it length- 

 ens must be planted shal- 

 low. 36. 



Ice often destroys low plants, 



127. 



Immature vs. ripe seeds, 107. 

 Imperfect flowers, 103. 

 Implements, for pruning, 267; 



for transplanting, 245, 246, 



247. 

 Improvement possible through 



plant variability, 271. 

 Individuals defined, 18. 

 Injury by cold, methods of 



averting, 127. 



