468 



VEGETABLE PHYSIOLOGY 



Respiration, 291 ; gaseous inter- 

 changes of, 291 ; masked by photo- 

 synthesis, 292 ; loss of weight in- 

 volved in, 295 ; intensity of, 297 ; 

 nature of the process of, 299 ; 

 relation of, to metabolism, 300 ; 

 influence of external conditions 

 on, 302 ; of seeds, 303 ; a source 

 of energy, 304 ; intramolecular or 

 anaerobic, 306 



Respiratory quotient, 297 



Rhamnase, 254, 259 



Rhamnus, 259 



Rhodophyceaz, 434 



Rhythm, of root-pressure, 88 ; 

 nature of, 360 ; affected by stimu- 

 lation, 403 ; induced, 404 



Ricinus, 182, 243 



Ripening, 457 



Robinia, 67 



Root-hairs, 73 ; action of, 74 



Root-parasites, 206, 350 



Root-pressure, 76, 86, 87 ; rhythm 

 of, 88, 91 ; method of measuring, 

 89, 91 ; amount of, 90 ; period- 

 icity of, 92 



Rush, construction of stem of, 

 116 



Saccharomyces, see Yeast 



SACHS, on theory of transport of 

 water in wood, 84 



Salvinia, 113 ; germination of mega- 

 spore of, 439 



Santalaceoe, 206, 350 



Saprolegnia, 402, 428, 459 



Saprophytes, 127, 191, 348 



Sarracenia, 194 



SAUSSUBE, DE, on Opuntia, 302 



Saxifraga, 253, 344 



Saxifragaceoe, 298 



Scirpus, 32, 33 



Sclerenchyma, 25, 29, 30, 34 



Scrophularia, 452 



Scrophulariacece, 206, 350 



Scutellum, epithelium of, 252, 

 255 



Scyphanfhus, 396 



Secretion, 267 



Seed, 440 ; formation of, 441 ; struc- 

 ture of, 444 ; germination of, 

 458 



Selaginella, prothallium of, 439 



Selective power, 181, 187 



Self-sterility, 453 



Sense organs, 411 



Sensitiveness, 365 ; variations of, 

 386; localisation of, 386, 392, 

 411 ; delicacy of, 394, 418 ; 

 maintenance of, 417 



Sex, differentiation of, 432 



Sexual cells, 430 



Sieve-tubes, 175, 224 



Silica, 56, 138, 279 



Silicates, 142, 186 



Silicic acid, 142 



Silicon, 135, 141, 180, 185 



Sinigrin, 245, 259 



Skeleton, of plastid, 2, 42 ; of plant, 

 34, 42 



Sleep movements, see Nyctitropic 

 movements 



Slime fungi, see Myxomycetes 



Sodium, 135, 141, 180, 185 



Soil, composition of, 72 



Sorus, 451 



Spermatium, 445 



Spermatozoids, 432 



Sphagnum, 22 



Spirogyra, 150, 157, 420, 426 



Splachnum, 191 



Sporangia, 428 



Spores, 428, 435 



Sporophyte, 435 



STAHL on method of detecting escape 

 of watery vapour, 95 



Starch, appearance of, during photo- 

 synthesis, 158 ; probable cause of 

 appearance of, in leaf, 160 ; forma- 

 tion of, as evidence of activity of 

 chlorophyll apparatus, 161 ; depo- 

 sition of, in chloroplasts, 219, 234; 

 removal of, from leaves, 230 ; 

 storage of, 234 ; deposition of, by 

 leucoplasts, 235 ; by protoplasm, 

 237 ; digestion of, 254 ; secretion 

 of, 270 



Statoliths, 392 



Stele of root, 75 



Stereome, 34 



Stimulation, 375 ; nature of, 377 ; 

 purposeful nature of responses to, 

 377, 415 ; localisation of, 387, 395 ; 

 after-effects of, 407 ; perception 

 of, 415 ; latent period of, 416 



Stimulus, nature of, 375 ; instances 

 of rhythmic, 379, 381 ; of lateral 

 light, 385 ; of gravitation, 388 ; of 

 contact, 392 ; of moisture, 400 ; 

 of oxygen, 401 ; chemical, 400 ; 

 relationship of response to, 415 ; 

 of fertilisation and pollination, 

 456 



