564 



INDEX 



of, by conduction, 398 ; by radiation, 398 ; 

 by transpiration, 44, 398. 



Tendrils, reacting all round, 490; senile 

 curvature in, 495 ; autotropism in, 493 ; 

 reacting unilaterally, 489 ; distribution 

 of sensitivity in, 490 ; curvature in, on 

 stimulation, 499 ; circumnutation in, 489, 

 530 ; perception in, 490, 491 ; stimula- 

 tion of both sides of, 490 ; due to chemical 

 influences, 492 ; due to electricity, 492 ; 

 due to contact, 491 ; due to temperature, 

 492 ; tropistic curvature in, 490 ; clasp- 

 ing of supports by, 495 ; distribution of 

 growth in, 488 ; nastic curvature in, 499. 



Tension, influence of on growth, 261. 



Tetrathionic acid, 229. 



Thermonastic, 499, 500, 502. 



Thermotaxis, 548. 



Thigmotaxis, 548. 



Thiosulphate, 229. 



Thiothrix, ii"}). 



Thyloses, 296. 



Tissue tensions, 297, 421. 



Tonotaxis, sec Osmotaxis. 



Torsion, 406 ; autonomous, 531 ; geotropic, 

 452, 453 ; heliotropic, 465 ; due to shrivel- 

 ling, 414. 



Tracheae and tracheides, see Vessels. 



Transitory nutation, 530. 



Translocation products, 148, 172; of 

 materials : from the leaf, 166 ; from store- 

 houses of reserves, 167; from seeds, 155, 

 168. 



Transpiration, 25, 35 ; dependence of, on 

 external conditions, 38 ; on stomata, 39 ; 

 on the structure of the plant, 37 ; in- 

 fluence of, on absorption of nutrients, 43 ; 

 on the temperature of the plant, 43 ; on 

 ascent of water, 74 ; acceleration of, 43 ; 

 formative results of, 317 ; amount of, 43 ; 

 significance of, 43 ; inhibition of, 42 ; in- 

 ternal, 37 ; cuticular, 38 ; stomatal, 38. 



Transplantation, 332. 



Traumatotaxis, 553. 



Traumatotropism, 486. 



Trees, annual periodicity in, 344; winter 

 transformation of starch into fat in, 



175- 



Tropism, 428, 499. 



Turgor, 13, 263, 418. 



Twining plants, 455 ; geotropism in, 457 ; 

 spiral movements of, 456 ; supports to, 

 458 ; torsions in, 458 ; twining of, 455. 



Twinings, 406 ; autonomous, 530 ; in ten- 

 drils, see Tendrils ; due to shrivelling, 

 412 ; in twining plants, 457. 



Tyrosin, 140, 174, 444. 



Undulatory nutation, 531. 



Unicellular, 272. 



Urea, as a nutrient, 143, 144 ; fermentation 



of, 224. 

 Uro-Bacteria, 224. 

 Urticaceae, stimulus movements in, 425. 



Vacuoles, 6. 



Variation, see Adaptation, Species, Muta- 

 tion ; fluctuating, 387 ; movements, 421 ; 

 autonomous, 528 ; geotropic, 453 ; helio- 

 tropic, 465 ; paratonic, 428. 



Vegetative growing point, 272 ; basal, 273 ; 

 structure of, 279-81 ; form of, 276 ; in- 

 tercalary, 273, 292; of the stem, 277; 

 symmetry of, 274, 276 ; capacity of, 273 ; 

 terminal, 273 ; growth in, 280 ; distri- 

 bution of, 284 ; of the root, 283 ; arrange- 

 ment of cells in, 279. 



Ventral, side, 276. 



Vessels, structure of, 66-70 ; functions of, 

 47, 172 ; contents of, 70; absorption of 

 water by, 49. 



Volume, alteration in, in growth, 258. 



Water, excretion of, see Bleeding, Tran- 

 spiration ; absorption of, by aerial organs, 

 32 ; by roots, 29 ; by cells, 24 ; influence 

 of different factors on, 31 ; excretion of, by 

 hydathodes, 58 ; significance of, in move- 

 ment, 539 ; movement of, in the plant, 

 45-7 ; influence of, in germination, 252 ; 

 in growth, 317; withdrawal of, 318; 

 conduction of, 25 ; influence of living 

 cells on, 74-6 ; through vessels, 47 ; by 

 capillarity, 72; rate of, 62; height of, 62; 

 amount of, 61 ; by parenchyma, 46 ; di- 

 rection of, 61 ; by suction, 64 ; in dead 

 trees, 75 ; by root pressure, 63 ; glands, 

 58 ; amount of in soil, 26, 318 ; in air, 

 318; capacity, 26 ; culture, 80; plants, 

 absorption by, 24 ; cause of form, 319. 



Wax, 4. 



Whorl, 274. 



Working energy, 205, 403, 404. 



Working materials, 148. 



Wounds, healing of, 328 ; regeneration 

 from, 329 ; as stimuli to protoplasmic 

 movement, 540 ; as directive stimuli, 

 486, 553- 



Xerophytes, adaptation in, 253. 



Zinc, 87. 



Zone of maximal growth, 289. 



Zymase, 211. 



/{- 



Oxford: Printed at the Clarendon Press by Horace Hart, Mj 



W. C. state aUege 



