INDEX. 



469 



Sage, 444 

 Salicales, 396 

 Salix, 348, 397 

 Salvia, 444 

 Samara, 365, 426 

 Sambucus, 449 

 Sanguinaria, 410 

 Sap, 3, 52, 62, 68 

 Sapindales, 424 

 Saprolegnia, 197, 198 

 Saprolegniales, 197 

 Saprophytes, 137 

 Sapwood, Si 

 Sargassnm, 185 

 Saxifrage, 354 

 Scabiosa, 450 

 Scenedesmus, 162 

 Schizocarp, 426 

 Schi/.ophyta, 139 

 Scitaminales, 387 

 Sclerenchyma, 63 

 Sclerotium, 218 

 Scouring rush, 305 

 Scrophulariaceae, 445 

 Scutellaria, 444 

 Scutellum, 121, 122, 376 

 Secondary growth, 71 

 Sedge order, 372 

 Sedum, 102, 346, 415 

 Seed, 320, 328, 340, 364 



development of, in, 112 



growth of, 113, 117 

 Seedling, castor bean, 119 



corn, 121 

 Seed plant, 320 

 Selaginella, 314, 315, 317 

 Selaginellaceae, 314 

 Sensitive plant, 30, 31 

 Sepals, 350 

 Seta, 264, 278 

 Sex, evolution of, 158, 165, 173, 177, 



179, 183, 187 

 Shade plants, 32-36 

 Shull, 126 

 Sieve tubes, 65, 66 

 Siphonales, 174 

 Skull-cap, 444 



Skunk cabbage, 379 

 Sleep movements, 30 

 Slime mould, 134, 135, 137 

 Smuts, 226, 227 

 Soapberry order, 424 

 Soils, nature of, 44, 46 

 Solanum, 448 

 Soredium, 239, 240 

 Sorus, 286, 294 

 Spadix, 378 

 Spathe, 378 

 Spathyema, 379 

 Species, 131 

 Sperm, 176, 248 

 Spermatophyta, 320 

 Sphaerella, 155, 156 

 Sphaeriales, 215 

 Sphagnales, 268 

 Sphagnum, 269, 271 

 Spirillum, 140 

 Spirogyra, 166, 167 

 Spongy mesophyll, 9, u, 20 

 Sporangia, 135, 285, 286, 294 

 Spore, 104 



differentiation of, 308 



germination of, 251, 307, 317 

 Sporophylls, 101, 294, 306, 346 

 Sporophyte generation, 122, 173, 



1 80, 193, 254 

 Sporophyte, development of, 265, 



281, 284, 289, 313, 327, 338 

 Stamen, 102, 366 

 Staminodia, 388 

 Starch, 2, 12, 16, 18, 19 



test for, 14 

 Staurastrum, 168 

 Steironema, 441 

 Stem, dicotyledon, 75, 78 



function of, 62 



growth of, 75, 76, 82 



healing of, 85 



modifications of, 89 



monocotyledon, 70, 82 



sensitiveness of, 88 



structure of, 62, 63, 70, 78 

 Stemonitis, 135 

 Stereome, 32, 63, 64 



