468 



INDEX 



Grains, starcli in, 177. 



ovary of, 289. 



pollen of, 289. 



■ carried by wind, 300. 



stigma of, 289. 



style of, 289. 



time for cutting, 314. 

 Grape attracts insects, 299. 



fruit production of, increased by bending, 

 318. 



girdling, 257. 



— of, stomata of, 317. 

 pltb of, 269. 



protection of pollen by, 295. 



root of, 102. 



self -sterility of, 309. 

 stem of, 268. 



rigidity of, 269. 



tendrils of, 272. 

 Grasses, are shallow-rooted, 134. 

 chaff of, holds water, 29. 

 germination of, 72. 

 growth at nodes, 250. 

 leaf scar of, 212. 

 ovary of, 289. 

 pollen of, 289. 



carried by wind, 300. 



position of leaves of, 217. 



protection of, against drying, 213, 334. 



— — — animals, 2!22, 

 relation to light, 265. 

 rhizome of, 277. 

 stigma of, 289, 292. 

 stomata of, 196. 

 style of. 389. 



Gravity, effect of. on direction of growth of 

 root and stem, 88,* 89.* 90, 91,* 92, 

 93,* 94, 95, 98,* 99, 2t>4. 276, 277. 

 effect of, on direction of growth of dower 

 and fruit, 308. 



Gravel stops rise of water in soil, 115. 



Gray, on sestivation, 213. 



Green flowers, cause of, 349, 359. 



— manures, 150, 384. 



— rays, partially cut out by potassium 



bichromate, 265. 



— rays partially cut out by cupra- 



ammonia, 265. 

 Ground. See Soil. 



Ground-squirrels bury seeub, 09. 

 Growth at nodes, 249, 2.=i0. 



correlations of, 79,* 359, 360. 



effect of heat on, 252. 



light on, 253. 



water on, 116.* 117, 252. 



food required for, 253. 



force of, in stem, 73,* 74,* 75.* 76.* 



— root, 81. 82,* 83, 84.* 85. 



of leaves, inequalities of, 251. 



oxygen necessary for, 5, 6,* 32, 33,* 34,* 

 35, 36, 37,* 38, 39,* 40, 12r5. 126. 281,* 

 283, 326, 



region of differentiation, 229. 



in root, 85.* 86. 



stem, 77.* 78.* 



relation of, to osmosis, 64-68. 



temporary vs. permanent, 67. 



the three regions of, 249.* 

 Guano as a fertilizer, 148, 153. 

 Guard-cell, 197, 198,* 199,* 200, 208,* 209,* 

 210,* 211.* 



artificial, 210,* 211.* 

 Gums lessen transpiration, 214, 216, 333. 

 Gymnocladus. See Kentucky Coffee Tree. 

 Gypsum. See Lime sulphate. 



Habit of plant, 264. 



Hfiemoglobin, 176. 



Hairs, absence of, from water plants, 339. 



effect of light on, 347. 



— protect against animals, 221, S.'ie. 



drying, 213, 214, 333, 334,* 3o5.* 



water and dust, 215. 



Hamamelis. See Hazel, Witch. 

 Hamburg, cholera epidemic of, 372, 373.* 

 Hanging drop, 293,* 395, 405. 

 Hardiness, 355, 412, 413. 

 Hardpan, 106, 351. 



alkali, 159. 

 Hiirper, acknowledgement to, x. 

 Hartley, on plant-breeding, 434, 441. 

 Harwood, on plant-breeding, 434. 

 Hawkweeds, behavior of scale leaves, 347. 

 Hawthorn, food in buds of, 253. 



protection of, 222. 

 Hay, sweating of, 388. 



time for cutting, 314. 

 Hays, on plant-breeding, 433, 441. 



