INDEX 
Stomata, 37, 80, 97; number of, 
in different plants, 99; mode of 
action of, 99 ; regulating influence 
of, on transpiration, 100 ; relation 
to gaseous interchanges, 117, 123 
Storage of food, 217, 230 
STRASBURGER, on composition of 
cell-walls, 49 ; on evaporation of 
water from cell-halls, 105 
Stratification of cell-wall, 50 
Style, reserve materials in, 233 
Stylogonidia, 429 
Stylospores, 429 
Suberin, 277 
Sugar, formation of, 158, 160; fer- 
mentation of, 307 
Sulphur, in proteins, 166; in 
protoplasm, 182 ; mode of absorp- 
tion, of, 141, 182 
Sundew, see Drosera 
Sunlight, influence of, on transpira- 
tion, 100 
Surplus food, construction of, 215 
Symbiosis, 191, 201 
Synergide, 442 
Tegumentary system, 24 
Telegraph plant, see Desmodium 
Temperature, influence of, on root- 
pressure, 90; on transpiration, 
101; on respiration, 302; range of, 
for different functions, 325; 
fluctuations of, 326 
Tendrils, 394. 
Tensions, in hollow stems, 34; in 
growing organs, 322 
Testa of seed, 444 
Thalictrum, 449 tt 
Theca, 436 
Thermotonus, 366 
Thesium, 206 
TIMIRIAZEFF on relative values of 
the rays of the spectrum in photo- 
synthesis, 162 
Tone, 366, 371, 373 
Torsion of stems, 396 
Tradescantia, 7, 358 
Translocation, of food, 213; direc- 
tion of, 222; path of, 225 
Transpiration, 80, 86, 93; methods 
of demonstrating, 93; amount 
of, 96; effect of excessive, 
96; influence of external con- 
ditions on, 100; suction of, 105 ; 
functions of, 330; relation to 
etiolation, 368 
Transpiration current, 83, 85 
469 
Trees, conditions of life of, 28 
Trépovux, 157 
Trehalase, 256 
TREUB on construction of protein 
in Pangium, 173 
Trichogyne, 432 
Tropwoum, 88, 159 
Tryptase, 254, 257 
Turgescence, 67; importance of, 
69; methods of restoring, in 
flaccid tissue, 96; affected by 
shaking branches, 102 
Turgor, 358; also see Turgescence 
Twigs, reserve materials in, 233 
Twining organs, 396 
Typha, 33 
Tyrosin, 172 
Tyiosinase, 305 
Ulothrix, 1, 421, 427, 431, 432 
UnczER on relative volumes of air 
and cellular tissue in leaves, 119 
Unicellular plants, 2 
Urea, 141 
Urease, 261 
UsHER AND PRIESTLEY, on photo- 
synthesis, 160 
Vacuole, 4; formation of 13, 62; 
function of, 14; occasional ab- 
sence of, 59; pulsating, 356, 359 
Vallisneria, 6, 358 
Vascular bundles, 26, 31 
Vaucheria, 430 
Vegetable acids, 277 
Vegetative propagation, 426 
Veins of leaf, 29, 77 
Velamen, 347 
Venus’s fly-trap, see Dionea 
Vicia, 409 
Victoria regia, 340 
VinEs on photosynthesis, 159: on 
ereptase, 259 
Viola, 454 
Vitis, 92 
Volvox, 10, 11 
Water, importance of, to proto- 
plasm, 13, 14; to plant in general, 
14; absorption of, by aquatic 
plants, 27; function of, in cell, 
59; circulation of, in plant, 59 ; 
exhalation of vapour of, 66, 299 ; 
hygroscopic, 73; absorption by 
root-hairs, 73; transport in root, 
74; in stem, 77; excretion of, 
81; mode of transport in wood, 
; 
t 
