INDEX 



469 



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 



STRASBUBGEB, 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 



Synergidae, 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 



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 



Trees, conditions of life of, 28 



TREBOUX, 157 



Trehalase, 256 



TRETJB on construction of protein 



in Pangium, 173 

 Trichogyne, 432 

 Tropceoum, 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 

 Ty rosin, 172 

 Tyiosinase, 305 



Ulothrix, 1, 421, 427, 431, 432 



UNGER 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 Dioncea 



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, 



