488 



INDEX 



Sunflower, seed of, resting period of, 44. 



seed-leaf of, sleep position of, 218, 



stem of, 224, 269. 

 Sunlight. See Light. 

 Sunscald, 346. 



Superphosphate, 139, 150, 153, 154. 

 Surface crust. See Soil, Crust of. 

 Surface mulch. See Soil mulch. 

 Sweet Pea. See Pea, Sweet. 

 Sweet Potato. See Potato, Sweet. 

 Swingle, on Date Palm, 294. 



on Fig, 310. 



Smuts, 400. 



variation due to environment, 421. 

 Switch Plants, 215, 331, 332,* 343.* 

 Synergidae, 291.* 



Synclines, 111. 

 Syringa. See Lilac. 



Taft, on soil, 133. 

 Tar excludes air from stems, 281. 

 Tarweed, dispersal of seeds of, 324. 

 Teleutospores, 402.* 

 Temperature. See Heat. 

 Tendrils, 270, 271,* 272, 273,* 274. 

 Terraces, experimental formation of, 111. 

 Texture of soil. See Soil, Physical condi- 

 tion of. 



Thigmotropism. 272, 273, 274. 

 Thinning of fruit, 312. 

 Thistle, dispersal of seeds of, 321, 322. 



protection of, against animals, 221. 

 Thorn apple, protection against animals, 



222, 320. 



Thorns protect against animals, 221. 

 Thyme, visited by bees, 299. 

 Thymus. See Thyme. 

 Tilia. See Linden. 



Tillage. See Soil, Physical condition of. 

 Tilletia. See Smut, Stinking. 

 Timothy, flower of, 280. 

 Tilth. See Soil, Physical condition of. 

 Tissue. See Cell and Histology. 

 Tobacco crossed with Petunia, 432. 



fermentation of, 388. 

 Tomatoes, canning of, 386. 



immature seeds of, germinate, 43. 



improvement of, by breeding, 409. 

 TmioVm-not. See Jewelweed. 



Toxins, 378, 379. 



Tracheid, 227,* 229, 230, 231,* 233, 234,* 235, 



236.* 



Tradescantia. See Wandering Jew. 

 Transpiration, 203* -205,* 206* -208,* 209,* 



210,*211*-218,*3]7, 328. 

 affected by enwrapping leaves, 251, 261. 



hairy coverings, 213, ^33, 334,* 335.* 



light, 206;* 207. 



position of leaves, 217, 218.* 



reduction of leaf-surface, 215, 331,* 



332,* 333, 342,* 343.* 

 in number of stomata, 215, 335, 



rolling and folding of leaf, 213, 334. 



- sinking of stomata, 215, 335, 337.* 



thicker cuticle, 333. 334,* 337,* 338.* 



water -proof substances, 214, 251, 



333, 334.* 



water- retaining substances, 216. 



wind, 208, 348. 



woody coverings, 317. 



Transplanting, 135, 136, 220, 359. 

 Trees, buds on roots of, 249. 



effect of flooding on, 125. 



frost on, 352, 353. 



heat on, 346. 



light on, 220, 261, 346, 359. 



fat, 259. 



pruning of, 263, 264. 



roots of, 87, 125, 136. 



fungi on, 150. 



seed of, how preserved, 46. 



self -pruning of, 261. 



starch, 259. 



struggle among branches of, 261, 262. 



sunscald of, 346. 



transplanting of, 13"5, 220, 359. 

 < treatment of, to increase fruit produc- 

 tion, 318, 319, 342. 



See, also, Forest and Stem. 

 Tree of Heaven. See Ailanthus. 

 Triticum. See Wheat. 

 Tropaeolum. See Nasturtium. 

 Trypsin, 171, 172. 

 Tuber, propagation by, 433. 



stem nature of, 260, 

 Tubercle bacteria, 149, 384, 385. 

 Tuberculosis, 366. 376, 380. 



