470 



INDEX 



Horse-chestnut, preparation of, for flower- 

 ing, 286. 



See, also, Buckeye. 



Horse- tail, protection of, against animals, 

 223. 



rhizome of, 277. 

 House plants, care of, 132, 136. 

 Houstonia, cross-pollination of, 305. 

 Howard, on mosquitoes, 380. 



on plant diseases, 407. 

 Hubrecht, on mutation, 453. 

 Hugging the ground as protection against 



animals, 223. 

 Humulus. See Hop. 

 Humus, 104. 



as fertilizer, 148. 



colors soils, 107. 



fixes plant-food, 145. 



of forest, 107. 



plant-food found in, 107, 351. 



properties of, 107. 



retains water in soil, 132, 133. 



test for, 155. 



Hunn, on gardening, 249, 263. 

 Hunt, acknowledgment to, x. 

 Hyacinth, preparation of, for flowering, 286. 



stomata of, 196. 



storage of food in. 286, 313. 



water, 340. 



Hybrids, character of, 411,* 413,* 416,* 422, 

 423,* 424,* 425,* 426,* 427,* 428, 429,* 

 434. 



denned, 421. 



Hydrochloric acid. See Acid, Hydrochloric. 

 Hydrogen, a product of decomposition of 

 cellulose, 381. 



in foods, 175, 



peroxide as disinfectant, 364. 

 Hydrolysis, 167. 



of starch, 167-169. 

 Hydrotropism, 95,* 96,* 97, 98. 



Ice, method of using, 5.* 



role in soil-formation, 109. 

 Ice Plant, protection of, against drying, 

 215. 



water reservoirs of, 216. 

 lies, on plant-breeding, 441. 

 Ilex. See Holly. 



Illinois Experiment Station, plant-breed 

 ing at, 434-439. 



river, sewage of, 382. 

 Immature seeds, germination of, 43. 

 Immortality of bacteria, 368. 

 Immortelle, protection of, against drying, 



334. 



Immunity, 379. 

 Impatiens. See Jewelweed. 

 Improved Beach Plum. See Plum, Im- 

 proved Beach. 



Inch Plant. See Wandering Jew. 

 India Ink, injection of wood with, 237. 

 Indigo rays cut out by potassium bichro- 

 mate, 265. 



Infectious diseases, 380. 

 Injury, effect on the plant of, 79,* 86, 263. 

 Insects bury seeds, 69. 



destroyed by crop rotation, 160. 



lime, 152. 



how supplied with oxygen, 176. 



method of alighting at flower of, 307. 



open flowers, 308. 



partial to certain colors, 298. 



protection against, by bark, 256. 



of flowers from, 308, 309. 



fruits from, 320. 



role of, in pollination, 289, 291. 297-311. 



trapped by plants, 172. 



unwelcome, 308. 



visual powers of, 300. 

 Insectivorous plants, 172. 

 Iodine solution, preparation of, 164. 



test for starch, 164, 367. 

 lodoform as disinfectant, 364. 

 Ipomcea. See Moonflower, Morning Glory 



and Sweet Potato. 

 Iris, cross-pollination of, 304.* 



flower of, platform of, 307. 



structure of, 304.* 



leaf of, structure of, 199,* 201. 

 protection of, against drying, 217, 333, 334. 

 water, 214, 294. 



pollen, 294. 

 rhizome of, 277. 



stomata of, 196, 199,* 208,* 209.* 



storage of food in, 260, 313. 

 Iron, needed by plants, 139. 

 Iron chloride, 171. 



