INDEX 



811 



Tetrad, 372 



Te trap his, 648 



Tetraploids, 475 



Thallus, 651, 652, 653 



Thermocline, 595 



Thiamin, 194 



Thorns, 83, 258, 259 



Timberline, 680 



Timothy spikes, 696 



Tissues, complex, 278; food-conducting, 



75; meristematic, 68; primary, 278; 



secondary, 278; sporogcnous, 372, 



373; water-conducting, 75 (see also 



appropriate organs of plant) 

 Toadstools, 542, 555 

 Tobacco, 54; leaf, 70; plants, 341 

 Tomato, fruit. 363; leaf, 322; plants, 



327 

 Top-root ratios, 190 

 Toxins, 524 

 Tracheids, 284 

 Tradescantia, 79 

 Transpiration, 221-232, 



absorption, 234, 242, 



crop yields, 236; and 



240, 

 322, 

 plant 



324 



323 



dis 



and 



and 



Uribu- 



tion, 237, 239; and soil water, 229; 



cooling effect of, 241; cuticular. 223; 



effects on plants, 80. 233-244; lifting 



power of, 227; pull. 230; rates of, 



226. 232, 235, 240; stomatal, 225 

 Triassic period, 723 

 Trichodesmiiim , 623 

 Trichogyne. 635 

 Trillium. 380, 493 

 Tri-palmitin, 139 

 Triple fusion, 376 

 Triploid, 451 

 Trisaccharides. 1 35 

 Tropical jungle. 791 

 Tropisms. 213. 214 

 Truffles, 553 

 Tryptophane, 144 

 Tschermak, 435 



Tubers, 189, 257, 408, 409. 410 

 Tufa, 644 

 Tulip, flower, fruit and seed. 353; root. 



302 

 Tundra, frontispiece, 31. 6.39, 741. 743. 



744, 745, 746 

 Turgor, 205. 212. 216 

 Tyloses, 285 



Ulmaceae, 705 

 Uloihrix, 614, 616, 636 

 Umbel, 360, 361, 713 

 Umbelliferae, 712 

 Unisexual, 671 

 Uredospores, 560 



Vacciniaceae, 713 



Vacuole, 60, 63, 65 



Vallisneri, 526 



Valves of diatoms, 625 



van Helmont, 102, 526 



Variations, 436, 490; heritable, 84-93, 

 4.36, 492; hybrid, 436. 492; mutant. 

 492; non-heritable, 436, 491 



Vaucheria, 616, 619, 620, 636 



Vegetable, 364; ivory, 698 ^ 



Vegetation, contrast on slopes, 239; of 

 North America, 740-795; types, 240, 

 741 



Vegetative bud, 335; multiplication, 191, 

 337, 400-422, 440, 646, 653, 661; or- 

 gans, 10; period, 14; propagules, 400 



Vein, 19, 71, 72; scar. 247; systems. 20, 

 111 



Venation, 20; dichotomous. 20, 21. 660; 

 palmate, 20, 21; parallel. 20. 21: pin- 

 nate, 20, 21 



Venus'.s-flytrap, 91, 219 



Vernation, 660 



Vessels, 264, 284 



Victoria regia, 85, 86; leaf, 87 



Vinca, leaf section of, 71 



Vinegar, 156 



Viruses. 521, 522, 584; diseases caused 

 by, 584, 585 



Vitamins, 28, 169. 174. 194. 520 



Volvox, 615 



von Dusch. 527 



von Schroeder, 527 



Walnut family, 703; flowers. 704 

 Water, 109, 123, 129, 139, 152, 168. 196, 



222; and bacteria, 517; bloom, 611; 



conducting cells {see Xylem); habitat, 



587, 589; hyacinth, 412; lily, 85, 86; 



loss from plants, 235, 236; lotus fruit. 



363; mold, 546; molecule, 95, 223 

 Water-holding substances, 230 



