482 



INDEX 



Rosette form as protection against ani- 

 mals, 223. 



of alpine plants, 357. 

 Rotation of crops, 160-161, 407, 408. 

 Roth, on forestry, 113, 245. 

 Rubber plant, 356. 



Rubus. See Blackberry, Raspberry. 

 Runoff, 113. 



Rushes, protection of, against animals, 223. 

 Russian Thistle, dispersal of seeds of, 322. 

 Rust, Black Stem, of Grain, 401, 402,* 403,* 

 404,* 405. 



Crown, of Oats, 405. 



Hollyhock, 406. 



Orange Leaf, of Wheat, 405. 

 Rye, germination of, 47. 



pepsin absent from, 172. 



Rust of, 405. 



Smut of, 400, 401. 



Saccharomyces. See Yeast. 



Sage, cross-pollination of, 305-306.* 



hairy covering of leaf of, 213. 



structure of flower of, 306,* 307. 



brush, protection of against drying, 334.* 

 St. Louis, water supply of, 382. 

 Saleratus v 154. 



Salicylic acid. See Acid, Salicylic. 

 Salix. See Willow. 

 Saliva^ 166, 167. 

 Salt, 161. 



as preservative, 385, 386. 



in osmosis, 18. 



in soil, test for, 158. 



sets free potash, 152. 

 Salt Bush tolerates alkali, 350. 

 Salt marshes, absorption difficult in. 217. 

 Saltpeter. See Potassium nitrate. 



Chili. See Sodium nitrate. 

 Salts in soil, 136-160. 



fixation of, by soil, 145-147. 

 form crust, 127, 129. 



hinder absorption, 18, 124, 217, 336. 

 needed by plant, 139, 140.* 



protect plant against dryness, 210. 

 Salvia. See Sage. 

 Sambucus. See Elder, 

 Sand, 104, 147. 



bound together by plants, 277. 



Sand, freed from plant-food, 155, 156. 



microscopical examination of, 105. 



percolation in, 113. 



plant-food in, 105, 146. 



power of, to lift water, 118. 



properties of, 105. 



water-holding capacity of, 132. 

 Sandy loam, 108. 



soil for cuttings, 262. 



Sap % , rise of, 224-245, 259 (224,* 225,* 227,* 

 231,* 232,* 234,* 236,* 237,* 238,* 240,* 

 213*). 



Sap wood, 244, 245. 

 Saponifieation, 170, 171. 

 Saprophytic bacteria, 380. 

 Saunders, on pruning, 264. 

 Scabiosa. See Scabious. 

 Scabious, protection of pollen of, 295. 

 Scale of boilers, 151. 

 Scale, bud. See Bud scale. 

 Scar. See Hilum. 

 Scarlet avoided by bees, 298. 

 Scarlet fever, 329, 376. 

 Scarlet Runner, 144. 



absorption of water by seed of, 12. 



germination of, 59, 60.* 



getting above ground of, 71. 



protection of tip of stem of, 71,* 79. 



transpiration of, 204. 



twining of, 275. 

 Scent. See Odor, 

 von Schrenk, on woods, 245. 



plant diseases, 407. 



de Schweinitz, on milk, 377. 



plant diseases, 407. 

 Scion, 248. 



Scirpus, strengthening fibers of, 267.* 

 Sclerenchyma. See Cell, Sclerenchyma. 

 Sea water, effect on germination of, 18. 



renders absorption difficult, 336. . 

 Seasoning of wood, 245. 

 Secale. See Rye. 



Sedges, protection of, against animals, 222. 

 Sedum. See Live-for-ever. 

 Seeds, air-dry, contain water, 7.* 



'air needed by, 30,* 31, 32,* 33, 36, 37,* 38, 

 39,* 40. 



burial of, in soil, 69, 70. 



carbon dioxide given off by, 6, 33, 34,* 35. 



