490 



INDEX 



Water, action of, on soil, 109-114,* 115*-119,* 

 120.* 129-133. 



amount of, in air-dry seed, 7.* 



soil needed by plants, 130, 131. 



wood, 245. 



needed for germination, 25, 26. 



as component of starch, 186. 



bacteria of, 368. 



buries seeds, 69. 



capillary, 113. 



decreasing, promotes fruit production, 

 319. 



distillation of, 137.* 



distributes seeds, 325. 



effect of, on direction of growth of roots, 

 89, 95,* 96,* 97, 98. 



form of plant, 326, 327,* 328,* 



329,* 330, 331,* 332,* 333,* 334,* 335,* 

 336,* 337,* 338,* 339,* 340,* 341, 342,* 

 343.* 

 - growth. 116,* 117, 252. 



energy required to raise, in stem, 239, 

 240*-243.* 



evaporation of, from leaves. See Trans- 

 piration. 



soil, 115. 

 filtration of, 372. 

 free, 113. 



hard, 151. 

 hygroscopic, 113. 

 injurious in stomata, 214, 

 in seeds, 7.* 

 in soil, 103, 111-135. 



- how regulated, 132, 133. 

 formation of, 109. 



lack of, effect on fruit of, 342. 



plant of. 88, 211-217, 326, 327,* 

 328,* 329*-331,* 332,* 333,* 334,* 335,* 

 336,* 337,* 338,* 339,* 340*-342,* 343.* 



needed by fruit, 316, 317. 



- plant, 135, 211, 326. 

 seed, 46. 



of ponds and rivers, plant-food in, 138. 

 path of, in root, 120,* 121. 



seed, 8,* 22. 23,* 24. 



stem, 224,* 225,* 226, 227*-231,* 



232*-236,* 237,* 244, 258. 

 percolation of, in soil, 111-114,* 115-118. 

 problem of obtaining, 6. 



Water, protection against, by callus, 263. 



hairs, 214. 



- wax, 214. 



purification of, 382. 



rate of travel through wood of, 238,* 239. 



rise of . in soil, 114, 115. 



role of, in starch formation, 187, 193, 202. 



sea, 18, 124, 217, 336. 



storage of, in plants, 331,* 334. 

 Water-bath, 67. 



Buttercup, 338, 339.* 



culture, 140.* 



glass, 387. 



hyacinth, 340. 



lily, 337, 339. 



closing of flower of, 295. 



protection of pollen of, 295. 

 Plantain, 342. 



plants, characteristics of, 337,* 338,* 339,* 



340*-342. 



polygonum, 335,* 336,* 340.* 

 reservoirs in plants, 216. 

 roots, 341. 

 table, 118, 135. 

 vapor, effect of, on opening and closing of 



flower, 296. 

 plant, 341. 



method of keeping air saturated with, 



26,* 27.* 



wheel, 93.* 

 Wax, absent from water-plants, 339. 



protects against drying, 214, 333, 334.* 



water, 214. 



Weather, effect of, on growth, 252 

 Weaving plants, 270. 

 Webber, on fertilizers, 153. 



plant-breeding, 433, 441. 



pruning, 264. 



variation due to environment, 421. 

 Weed, on pollination, 407. 



Weeds, destroyed by crop-rotation, 160. 



harbor disease, 407. 



Weeping Willow. See Willow, Weeping. 

 Wells, whistling, 125. 

 Wheat, 130, 138, 155. 



early, how secured, 355. 



germination of, 47, 81. 



immature seeds of, 43. 

 microscopical examination of, 177, 178. 



