458 
of estimating rate of transpiration 
current, 81 
Salvinia, 107 ; germination of mega- 
spore of, 430 
Santalacee, 200, 342 
Saprolegnia, 393, 419, 449 
Saprophytes, 121, 185, 341 
Sarracenia, 135, 189 
Saussurz, Dz, on Opuntia, 296 
Saxifraga, 247, 336 
Saxifragacee, 292 
Scirpus, 27, 29 
Sclerenchyma, 21, 25, 29 
Scrophularia, 442 
Scrophulariacee, 200, 342 
Scutellum, epithelium of, 246, 249 
Scyphanthus, 387 
Secretion, 261 
Seed, 429; formation of, 432 ; struc- 
ture of, 484; germination of, 448 
Selaginella, prothallium of, 430 
Selective power, 175, 182 
Self-sterility, 443 
Sense organs, 400 
Sensitiveness, variations of, 878 ; 
localisation of, 378, 382, 401; 
delicacy of, 385, 409; mainte- 
nance of, 408 
Sex, differentiation of, 423 
Sexual cells, 421 
Sieve-tubes, 170, 218 
Silica, 50, 133, 273 
Silicates, 136, 180 
Silicic acid, 136 
Silicon, 129, 136, 175, 180 
Sinigrin, 239, 254 
Skeleton, of plastid, 2, 37; of plant, 
25, 37 
Sleep movements, see Nyctitropic 
movements 
Slime fungi, see Myxomycetes 
Sodiuth, 129, 136, 175, 179 
Soil, composition of, 67 
Sorus, 441 
Spermatium, 436 
Spermatozoids, 423 
Sphagnum, 19 
Spirogyra, 145, 152, 411, 427 
Splachnum, 185 
Sporangia, 419 
Spores, 419, 426 
Sporophyte, 426 
Sraux on method of detecting escape 
of watery vapour, 90 
Starch, appearance of, during photo- 
synthesis, 153 ; probable cause of 
appearance of, in leaf, 156 ; forma- 
tion of, as evidence of activity of 
chlorophyll apparatus, 156; depo- | 
VEGETABLE PHYSIOLOGY 
sition of, in chloroplasts, 214, 228; 
removal of, from leaves, 224 ; 
storage of, 228; deposition of, by 
leucoplasts 229, by protoplasm 
231; digestion of, 249; secretion 
of, 264 
Statoliths, 383 
Stele of root, 69 
Stimulation, 367; nature of, 369; 
purposeful nature of responses to, 
369, 406 ; localisation of, 378, 386; 
after-effects of, 398; perception 
of, 406; latent period of, 407 
Stimulus, nature of, 367; instances 
of rhythmic, 371, 374; of lateral 
light, 377; of gravitation, 379 ; of 
contact, 383; of moisture, 390; 
of oxygen, 392; chemical, 391 ; 
relationship of response to, 406; 
of fertilisation and pollination, 
446 
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, 211, 224 
STRASBURGER, on composition of cell- 
wall, 43; on evaporation of water 
from cell-walls, 100 
Stratification of cell-wall, 44 
Style, reserve materials in, 227 
Stylogonidia, 420 
Stylospores, 420 
Suberin, 271 
Sugar, formation of, 153, 156; fer- 
mentation of, 301 
Sulphur, in proteins, 161, 175 ; mode 
of absorption of, 136, 176 
Sundew, see Drosera 
Sunlight, influence of, on transpira- 
tion, 95 
Surplus food, construction of, 209 
Symbiosis, 185, 195 
Synergide, 433 
Tegumentary system, 19 
Telegraph plant, see Desmodium 
Temperature, influence of, on root- 
pressure, 85 ; on transpiration, 96; 
on respiration, 296; range of, for 
different functions, 319; fluctua- 
tions of, 320 
Tendrils, 385 
Tensions, in hollow stems, 30; in 
growing organs, 316 
Testa of seed, 434 
Thalictrum, 439 
