INDEX 
Thallophytes, 426 
Theca, 427 
Thermotonus, 359, 365 
Thesium, 200, 388 
TMIRIAzErF on relative values of 
the rays of the spectrum in photo- 
synthesis, 157 
Tone, 359, 364, 366 
Torsion of stems, 387 
Tradescantia, 7, 850 
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 
Tripoux, 152 
Trehalase, 250 
TrEvB on construction of protein 
in Pangiwm, 168 
Trichogyne, 424 
Tropeolum, 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 
Tyrosiv, 167 
Tyrosinase, 299 
Ulothriz, 1, 411, 418, 421, 422 
Unger on relative volumes of air 
and cellular tissue in leaves, 113 
Unicellular plants, 2 
Urea, 135 
Urease, 255 
UsuHER AND Prizstury, 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 
459 
Vaucheria, 421 
Vegetable acids, 270 
Vegetative propagation, 417 
Veins of leaf, 22, 72 
Velamen, 340 
Venus’s fly-trap, see Dionea 
Vicia, 400 
Victoria regia, 332 
Vines on photosynthesis, 155; on 
erepsin, 252 
Viola, 444 
Vitis, 87 
Volvoz, 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 
WizsyeEr on heliotropism, 398 
Withering, 91 
Wood, 22 
Xanthophyll, 143, 271 
Xerophytes, 336 
Yeast, 2, 301, 412, 420 
Zein, 164 
Zine, 129, 175 
Zirconium, 175 . 
Zooceenocyte, 421 
Zoogonidia, 1, 419 
Zoophilous flowers, 439 
Zoospores, 1, 419 
Zygnema, 145, 422 
Zygospore, 422, 425 
Zygote, 425 
Zymase, 255 
Zymogen, 245 
Spottiswoode & Co. Ltd., Printers, New-street Square, London, 
