6 3 8 
INDEX 
Stamens, 417 
Stangeria, 411 
eriopus, 598 
paradoxa, 598 
Starch-making, 77 
steps in, 79 
Stems, elongation of. 118 
exogenous, 65 
Sterilization, 162 
progressive, 432 
Stigma, 437 
Stimulus and response, 125 
Stock, 335 
Stolons, 164. 349, 350 
Stoma, 33, 35 
Stomata and gaseous exchange, 108 
Strata, classification of rock, 583 
Stratification, 582 
Strawberries, 348 
Strobilus, 371 
Struggle for existence, 190, 513, 515 
Style, 437 
Sugar-beet, 68 
Sugar-cane, 68 
Sugar-maple, 336 
Suminski, Count Lesczyc, 168 
Sundew, 87, 88, 347 
Sunlight, importance of, 75 
Survival of the fittest, 191, 515 
Suspensor 380 
Swarm-spores, 251 
Sweet clover, yellow, 82 
Sweet pea, 470 
Symbionts, 318 
Symbiosis, 214, 321, 324, 325 
social, 325 
Symmetry, bilateral, 167 
Sympetalae, 456, 473 
Symplocarpus fcetidus, 496, 499, 
500 
Synangia, 601 
Synergids, 440 
Tap root, 10 
Taraxacum, 486 
Taxonomy, 4 
Tectoria cicutaria, 161, 163 
Tetrad, 158 
Tetrad-divisions, 158, 187 
Tetraphis, 207 
Thallophytes, 366 
Thallus, 167 
Thecium, 330, 331 
Thyme, 479 
Thyrsopteris elegans, 157 
Tillandsia, 326 
Tissue-tension, 117 
Toadflax, 481, 482, 483, 484, 485 
Toadstool, 288 
Tobacco, 480 
Todea barbara, 157 
Tomato, 335, 450, 480 
Torus, 464 
Tour, Cagniard de la, 98 
Toxins, 313 
Trachymyrmex obscurior, 326 
Transpiration, advantages of, 40 
control of, 38 
cuticular, 38 
lifting power of, 42 
stomatal, 38 
Tree ferns, 150 
Tree, genealogical, 577 
Trifolium hybridum, 469 
Triticum, 298 
vulgare, 494 
Trollius, 462 
Tropaeolum majus, 137, 143 
Trunk, 412 
excurrent, 413 
deliquescent, 414 
Trypsin, 102 
Tube-cell, 423 
