INDEX 



575 



276, 281; S. rupestris, 310, 314; S. 

 apus, 310; S. cuspidata, 310, Fig. 276; 

 K. stolonifera, 310, Fig. 276 ; S. lepido- 

 phylla, 501. 



Selaginellineae, 304, 310, 501. 



Serai-lichens, 188. 



Seminiferous scale, 338, 339. 



Senecio : S. aureus, 401, Fig. 377. 



Sensitive-fern (see "Onoclea sensibilis"). 



Sensitive organs, 486, 522. 



Sensitive plant (nee "Mimosa"). 



Sepal, 27, 32, 350. 



Septicidal dehiscence, 367. 



Sequoia, 332, 333, 335, 336, 337, 338, 339, 

 340, 341, 343, 347, 537, 538, 544; S. gi- 

 gantea, PL I.; iS. sempervirens, 333, 

 336, 337, 339, 340, 341, Figs. 295, 300, 

 305, 455, 548. 



Serjania, 408. 



Sessile leaves, 25. 



Seta, 204, 233. 



Sexual reproduction, 9, 13, 65, 93, 119, 

 125, 140, 151, 160, 163, 168, 171, 208, 210, 

 213, 218, 220, 228, 248, 270, 305 ; Angi- 

 osperms, 355-357 : Archegoniates, 196, 

 197; Fungi, 151; Phfeophyceae, 125; 

 Rhodophyceae, 140 ; Spermatophytes, 

 324, 325. 



Shepherd's-purse (see also "Capsella"), 

 155. 



Shield (in Characese), 120. 



Shock, as stimulus, 484. 



Shoot, 18, 22. 



Sicana, 488. Fig. 459. 



Sieve-tube, 59, 127, 131, 257, 298, 334, 

 465. 



Sigillaria, 533, 534. 



Silene, 423, 424, 426; S. Virginica, Fig. 

 410. 



Silicon, 7, 38, 52, 296, 299, 478, 480. 



Silphium, 400. 



Silurian formations, 530, 531. 



Silver, 39. 



Simarubaceae, 445. 



Simplest living forms, 4, 67. 



Simplest plants, (56. 



Siphoneae, 12, 14, 47, 52, 94, 112, 113, 114, 

 115, 122, 152, 530; fossil S., 530; ma- 

 rine S., 113, 114; structure and repro- 

 duction, 112-114. 



Sisyrinchium, 380, 391; S. bellum, Fig. 

 353. 



Sitka-spruce (see "Picea Sitchensis ") . 



Skeletal structures, 57. 



Skunk-cabbage (see also " Symplocar- 

 pus"), 547. 



Sleep-movements, 8, 486, 491, 492. 



Slime-moulds (see also " Myxomycetes," 



"Mycetozoa"), 12, 34, 39, 43, 68, 71, 



461, 489. 



Sloth (see "Bradypus"). 

 Smilacina, 381. 

 Smilax, 24, 26, 375, 377, 519. 

 Smuts, 149, 163, 174, 176. 

 Snails, agents in pollination, 516. 

 Snapdragon (Antirrhinum), 22. 

 Snow-berry (see " Symphoricarpus"). 

 Snowdrop (Galanthus), 490. 

 Snow-plant (Sarcodes sangiiinea), 450, 



506. 



Sodium, 7. 

 Sodium chloride, 39. 

 Soil, /properties of, 468. 

 Solanaceae, Solanineae, 458. 

 Solanum, 367, 453; S. dulcamara, Figs. 



334, 443. 

 Solidago, 546. 



Soluble substances in the protoplast, 53. 

 Somatic cells, 8. 

 Sonchus oleraceus, 59, Fig. 41. 

 Sonneratiacese, 447. 

 Sordaria, 172. 

 Soredia, 190. 

 Sorrel, 422. 

 Sorus, 263. 

 Sparaxis, 391. 

 Sparganiaceae, 384. 

 Sparganium, 55, 352, 354, 356, 357, 371, 



372, 379, 380, 383, 384 ; S. simplex, Figs. 



318, 319, 321, 322, 352; S. eurycarpum, 



Fig. 356 ; S. Greenii, 384. 

 Spadix, 388. 



Spanish-moss (see "Tillandsia"). 

 Sparmannia, 486, 488. 

 Spathe, 363, 388, 389. 

 Spathicarpa: S. sagittsefolia, 388, 389, 



Fig. 363. 



Spathffiorae, 381, 388, 389. 

 Spawn (of Mushroom) , 180. 

 Spermatium, 137,151,176; Lichens, 191. 

 Spermatozoids, 8, 39, 43. 48, 65, 66, 94, 



195, 197, 203, 213, 242, 243, 250, 323, 



325, 329, 331, 487. 

 Spermatophyta (see also "Seed-plants," 



" Flowering plants"), 11, 51, 322, 466, 



482. 



Sperm -cell, 31. 



Sperm-filaments of Characeae, 120. 

 Spermogonia, 173, 176, 191. 

 Sphacelaria, 125 ; S. filicina, Fig. 96. 

 Sphacelariacese, 126, 134. 

 Sphagnales, 236, 237. 

 Sphagnum, 223, 225, 227, 231, 236, 237, 



238; S. sp., Fig. 200; 5. squarrosum, 



Fig. 201; S. cymbifolium. Fig. 202; 



S. acutifolium, Fig. 203. 



