458 



VEGETABLE PHYSIOLOGY 



Salvinia, 107 ; germination of me- 

 gaspore of, 429 



Santalacea, 214, 343 



Saprolegnia, 394, 419, 448 



Saprophytes, 135, 198, 341 



Sarracenia, 149, 202 



SAUSSURE, DE, on Opuntia, 128 



Saxifraga, 261, 337 



Saxifragacece, 124 



Scirpus, 27, 29 



Sclerenchyma, 21, 25, 29 



Scrophularia, 441 



Scrophulariacece, 214, 343 



Scutellum, epithelium of, 260, 263 



Scyphanthus, 388 



Secretion, 275 



Seed, 429 ; formation of, 431 ; struc- 

 ture of, 433, germination of, 447 



Selaginella, prothallium of, 430 



Selective power, 188, 195 



Self-sterility, 442 



Sense organs, 400 



Sensitiveness, variations of, 379 ; 

 localisation of, 379, 382, 401 ; 

 delicacy of, 386, 409 ; mainte- 

 nance of, 408 



Sex, differentiation of, 423 



Sexual cells, 421 



Sieve-tubes, 182, 232 



Silica, 50, 287 



Silicates-, 150, 193 



Silicic acid, 150 



Silicon, 143, 150, 188, 193 



Sinigrin, 253, 267 



Skeleton, of plastid, 2, 37 ; of plant, 

 25,37 



Sleep movements, see Nyctitropic 

 movements 



Slime fungi, see Myxomycetes 



Sodium, 143, 150, 188, 192 



Soil, composition of>f>7 



Sorus, 440 



Spermatium, 435 



Spermatozoids, 423 



Sphagnum, 19 



Spirogyra, 159, 166, 411, 427 



Splachnum, 198 



Sporangia, 419 



Spores, 426 



Sporophyte, 426 



STAHL on method of detecting escape 

 of watery vapour, 90 



Starch, appearance of, during photo- 

 synthesis, 166 ; probable cause of 

 appearance of, in leaf, 169 ; forma- 

 tion of, as evidence of activity of 

 chlorophyll apparatus, 170 ; depo- 

 sition of, in chloroplasts, 228, 242 ; 

 removal of, from leaves, 238 ; 



storage of, 242 ; deposition of, by 

 leucoplasts 243, by protoplasm 

 245 ; digestion of, 263 ; secretion 

 of, 279 



Stele of root, 69 



Stimulation, 368 ; nature of, 370 ; 

 purposeful nature of responses to, 

 370, 405, 406 ; localisation of, 379, 

 387 ; after-effects of, 398 ; percep- 

 tion of, 405 ; latent period of, 407 



Stimulus, nature of, 368 ; instances 

 of rhythmic, 372, 374 ; of lateral 

 light, 378 ; of gravitation, 380 ; of 

 contact, 384, 389 ; of moisture, 

 391; of oxygen, 392; chemical, 

 392 ; relationship of response to, 

 406 ; of fertilisation and pollina- 

 tion, 445 



Stomata, 33, 75, 92; number of, 

 in different plants, 94 ; mode of 

 action of, 94 ; regulating influence 

 of, on transpiration, 95 ; relation 

 to gaseous interchanges, 112, 117 



Storage of food, 225, 238 



STRASBURGER, on composition of cell- 

 wall, 43 ; on evaporation of water 

 from cell-walls, 100 



Stratification of cell-wall, 44 



Style, reserve materials in, 241 



Stylogonidia, 420 



Stylospores, 420 



Suberin, 285 



Sugar, formation of, 166, 169 ; fer- 

 mentation of, 301 



Sulphur, in proteids, 143, 188 ; mode 

 of absorption of, 150 



Sundew, see Drosera 



Sunlight, influence of, on transpira- 

 tion, 95 



Surplus food, construction of, 222 



Symbiosis, 198, 210 



Synergida?, 433 



Tegumentary system, 19 



Telegraph plant, see Desmodium 



Temperature, influence of, on ix>ot- 

 pressure,85 ; on transpiration, 96 ; 

 on respiration, 129 ; range of, for 

 different functions, 320 ; fluctua- 

 tions of, 321 



Tendrils, 386 



Tensions, in hollow stems, 30; in 

 growing organs, 317 



Testa of seed, 433 



Thalictrum, 438 



Thallophytes, 427 



Theca, 427 



Thermotonus, 360, 366 



