INDEX. 



Sensitive plant, 302 (see Mimosa 

 pudica) 



Sensitiveness of motile organs, 544 



Seta, 629 



Sexual affinity, 648 



Sexual process; 601, 643; in Algse, 

 606; in Archegoniata, 6 to; in Con- 

 jugatae, 612; in Floridese, 613; in 

 Fungi, 617; in Phanerogams, 615 



Sexuality of plants, degeneration of, 

 605, 6r8, 620, 623; development of, 

 605 



Shoots ; external directive influences on 

 growth of, 497 ; on normally etiolated, 

 385 ; on structure of etiolated (Fig. 



4 2 ) 387 



Sicyos angulatus, tendrils of, 484 



Sieve-tubes (Fig. 23), 22, 167 



Silica, in cell-walls, 21 ; in plants, 61 



Silicon, in food, 137 



Silphium laciniatum, fixed light-posi- 

 tion of, 446 



Simple nutation, 361 



Siphonese, reproduction of, 607 



Sirogonium sticticum, reproduction of, 

 642 



Sleep-movements, 539; tracing of 

 (Averhoa bilimbi) (Fig, 58), 540; of 

 Hedysarum (Desmodium) gyrans, 

 (Fig. 60), 542; of Mimosa pudica 



(Fig. 5?), S4J 



Sodium, m food, 130 



Soil; condensation of aqueous vapour 

 by, 48 ; hygroscopic water of, 48 ; 

 retention of soluble salts by, 49 



Solanum dulcamara, twining of, 513 



Solanum jasminoides, clasping of pe- 

 tiole of (Fig. 46), 412 



Solms-Laubach, on reproduction of 

 Corallineae, 615 



Somatic cells, 597 



Somatotropism (Fig. 52), 475 



Sonchus arvensis, changes in light- 

 position of, 430 



Sorauer 



on calcium oxalate in plants, 231 

 on relation between supply of 

 water and growth, 335 



Sorby 



on the composition of chlorophyll, 

 '54 

 on erythrophyll, 267 



Soredia, of Lichens, 599 



Sowinsky, on conductivity of wood, 

 316 



Spallanzani, on somatotropism, 475 



Sparmannia, movement of stamens of, 

 545 



Specific absorbent capacity, 59, 64 



Specific irritability, 374 



Spermatia, 531, 614 (Fig. 73), 623 



Spermogonia, 623 



Sphacelaria, gemmse of, 599 



Spiral growth, 509 



Spirogyra, conjugation of (Fig. 69), 

 612; contraction of protoplasm in, 

 567; streaming of protoplasm in, 524 



Spontaneous heterauxesis, 376 



Spontaneous movements; conditions of, 

 537 ; inhibition of, by light, 544 ; of 

 growing organs, 360; of mature 

 organs, 531 



Sporangiferous leaves, 604 



Sporangium, 600 



Spore : germination of, 626 ; reproduc- 

 tion, 597 ; structure of, 600 



Spores, different kinds of, 602 



Sporogonium, 629 



Sporophore, 628 



Stalli- 

 on Compass-plants, 446 

 on direction of growth of Vaucheria, 

 in light, 441 



on fixed light- positions of leaves, 



445 



on geotropism of rhizomes, 501 

 on movements ; of chlorophyll-cor- 

 puscles (Fig. 36), 299, 525, 527; of 

 Desmids, 520; of plasmodia, 528 



on reproduction of Lichens, 622 

 (Fig- 73) 

 on structure of leaves, 384 



Stamens, 604 



Starch, conversion of into sugar (Fig. 

 28), 183, 191; formation of, 145, 147, 

 180, 217 



Starch-cellulose, 183 (Fig. 28) 



Starch -forming corpuscles (amyloplasts) 

 (Fig. 26), 1 80 



Starch-grains, growth of (Fig. 26), 181 ; 

 optical properties of, 35 (Fig. 27), 

 182; stratification of, 181; striation 

 of, 181; structure of, 35, 179 



Stebler, on growth in length of leaves, 



340 



Stereoplasma, 656 



Sterigmata, 623 



Stimulating effect of contact, 484; of 

 gravity, 458; of heat, 377; of light, 

 299, 400, 435, 576; of pressure, 411 



Stimulation, 301, 371 



Stimuli, transmission of, 374, 438, 468, 

 474, 487, 582 



Stolimann, on retention of salts by soil, 



49 



Stokes, on chlorophyll, 154 

 Stomata, 70; effect on transpiration, 



107; mechanism of movements, 107 

 Stomatal transpiration, 107 

 "Stossweise Aenderungen, " 358, 375 



