4S<^ 



rXDKX 



Sunflower, seed of, resting period of, ■W. 



seed-leaf of, sleep position of, 218, 



stem of, 224. 269. 

 Sunlight. See Light. 

 Sunscald, 346. 



Superphosphate, 139, 150, 153, 1.54. 

 Surface crust. See Soil, Crust of. 

 Surface mulch. See Soil mulch. 

 Sweet Pea. See Pea, Sweet. 

 Sweet Potato. See Potato, Sw^tt, 

 Swingle, ou Date Palm, 294. 



— on Fig, 310. 



— Smuts, 400. 



— variation due to environment, 421. 

 Switch Plants. 21.'>, 331. 332,* 343.* 

 Synergidaa, 291.* 



Synclines, 111. 

 Syringa. See Lihir, 



Taft, on soil, 133. 

 Tar excludes air from stems, 281. 

 Tiirweed, 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 nf fruit, 312. 

 Thistle, dispersal of seeds of, 321, 322, 



protection of, against animals, 221. 

 Thorn apple, protection against aiiiinnls, 



222, 320. 

 Thorns protect against animals, 221. 

 Thyme, visited by liees, 2!i!). 

 Thymus. See Thyme. 

 Tilia. See Linden. 



Tillage, See Soil, Physical cnndition nf. 

 Tilletia. See Smut, Stinking. 

 Timothy, flower of, 280. 

 I'ilth. See Soil, Physical condition of. 

 Tissue. See Cell and Histology. 

 Toli.Hcco crossed with Petunia, 432 



fermentation of, 388. 

 l^lmatoeN, canning of, 386. 



hnmature seeds of, germinate, 43. 



improvement of, by breeding, 409. 

 Touch-me-nnt, 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,*317, 328. 

 affected by enwrapping leaves, 251, 261. 



hairy coverings, 213, 'iZZ, 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, 33,'), 



336,* 

 rollingandfoldingof leaf, 213, 334. 



— — sinking of stomata, 215, 33."), 337.* 



thicker cuticle, 333, 334,* 337,* 3:{K.* 



water -proof substances, 214, 2ril, 



333, 334,* 



water-retaining substances, 216. 



wind, 208, 34S, 



woody coverings, 317. 



Transplanting, 135, 136, 220, 359, 

 Trees, buds on roots of, 249. 



effect of fl^ooding on, 12ri. 



— — frost on, 3.")2, 3.-'.3. 

 heat on, 34G, 



light on, 220, 261, 346, 359. 



fat, 2.->9, 



pruning of, 2G3. 264. 



ri.ots of, 87, 125, 136. 



— — fungi on, 150. 



seed of, how preserved, 46. 



self -pruning of, 261, 



stax'ch, 2.')9. 



struggle among hrain-lie-^ of, 261, 262. 



sunscald of, 346. 



transplanting of, 13), 220, 359. 



treatment of, to increase fruit produc- 

 tion, 31K, 319. 342, 



See, also. Forest and Stem. 

 Tree of Heaven. See Ailanthus 

 Triticum, See Wheat. 

 Tropseolum, See Nasturtium. 

 Ti-ypsin, 171, 172. 

 Tuber, propagation by, 433. 



stem miture of, 260, 

 Tubercle Imcteria, 149, 3SI, 38.j. 

 Tuberculosis, 366, 376, 3H0. 



