INDEX 



459 



Thallophytes, 426 



Theca, 427 



Thermotonus, 359, 305 



Thesium, 200, 388 



TMIUIAZEFF on. relative values of 

 the rays of the spectrum in photo- 

 synthesis, 157 



Tone, 359, 364, 366 



Torsion of stems, 387 



Tradescantia, 7, 350 



Translocation, of food, 207; direc- 

 tion of, 216 ; path of, 219 



Transpiration, 75, 81, 88; methods 

 of demonstrating, 88 ; amount 

 of, 91 ; effect of excessive, 91 ; 

 influence of external conditions 

 on, 95; suction of, 100; functions 

 of, 324 ; relation to etiolation, 

 361 



Transpiration current, 78, 80 



Trees, conditions of life of, 24 



TREBOUX, 152 



Trehalase, 250 



TBEUB on construction of protein 

 in Pangium, 168 



Trichogyne, 424 



Tropceolum, 83, 153 



Trypsin, 248, 251, 252 



Turgescence, 61 ; importance of, 

 64 ; methods of restoring, in 

 flaccid tissue, 91 ; affected by 

 shaking branches, 97 



Turgor, 350 ; also see Turgescence 



Twigs, reserve materials in, 227 



Twining organs, 387 



Typha, 27, 29 



Tyrosin, 167 



Tyrosinase, 299 



Ulothrix, 1, 411, 418, 421, 422 

 UNGEP. on relative volumes of air 



and cellular tissue in leaves, 113 

 Unicellular plants, 2 

 Urea, 135 

 Urease, 255 



USHER AND PRIESTLEY, 156 

 Utricularia, 187 



Vacuole, 4 ; formation of, 13, 56 ; 

 function of, 14 ; occasional ab- 

 sence of, 54 ; pulsating, 347, 352 



Vallisneria, 6, 350 



Vascular bundles, 22, 27 



Vaticlieria, 421 



Vegetable acids, 270 



Vegetative propagation, 417 



Veins of leaf, 22, 72 



Velamen, 340 



Venus's fly-trap, see Dioncea 



Vicia, 400 



Victoria regia, 332 



VINES on photosynthesis, 155 ; on 



erepsin, 252 

 Viola, 444 

 Vitis, 87 

 Volvox, 9, 10 



Water, importance of, to proto- 

 plasm 13, 14, to plant in general 

 14; absorption of, by aquatic 

 plants, 22; function of, in cell, 

 54 ; circulation of, in plant, 54 ; 

 exhalation of vapour of, 60, 125 ; 

 hygroscopic, 68; absorption by 

 root-hairs, 69 ; transport in root 

 70, in stem 72 ; excretion of, 76 

 mode of transport in wood, 79 

 exudation of, under pressure, 83 

 exudation affected by salts, 86 



Water-culture, 126, 172 



Water-glands, 337 



Wax in cell -walls, 50 



W T IESNER on heliotropism, 398 



Withering, 91 



Wood, 22 



Xanthophyll, 143, 271 

 Xerophytes, 336 



Yeast, 2, 301, 412, 420 



Zein, 164 

 Zinc, 129, 175 

 Zirconium, 175 

 Zoocoenocyte, 421 

 Zoogonidia, 1, 419 

 Zoophilous flowers, 439 

 Zoospores, 1, 419 

 Zygnema, 145, 422 

 Zygospore, 422, 425 

 Zygote, 425 

 Zymase, 255 

 Zymogen, 245 



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