504 



INDEX 



Seed, 351, 352, 360, 372, 397, 398 



development of, 125, 126, 130 



forms of, 126, 127 



functions of, 127 



growth of, 127-136 

 Seedling, castor bean, 132, 133 



corn, 134, 135 

 Seed plant, 352 

 Segregation of factors, 141 

 Selaginella, 346, 347, 348, 350 

 Selaginellaceae, 346 

 Senna family, 450 

 Sensitive pea, 451, 452 



plant, 35, 36, 455 

 Sensitiveness of leaf, 33 



of protoplasm, 4, 5, 152 



of root, 61 



of stem, 104, 106 



of zoospores, 176 

 Sepals, 384, 441 

 Seta, 289, 291, 309 

 Sex, evolution of, 178, 180, 181, 182, 



194, 198, 204 

 Sexual generation, 136, 137, 279 

 Sexuality, nature of, 171, 172, 177, 



181, 185, 204 

 Shade plants, 41, 44 

 Shin leaf, 470, 471 

 Sieve tubes, 79, 80 

 Silicates, 48, 170, 173, 336 

 Silk, of corn, 134 

 Siphonales, 195 

 Skull-cap, 477 

 Skunk cabbage, 412 

 Sleep movements, 35 

 Slime mould, 149, 150, 151 

 Smallpox, 163, 164 

 Smuts, 257 

 Soapberry order, 456 

 Soils, care of, 54, 55 



formation of, 48-50 



nature of, 50-52 



■retention of substances by, 52 



sterility of, 53-55 



structure of, 51 



texture of, 51 

 Solanum, 481 

 Soldier's cap, 443, 444 . 



Solomon's seal, leaf, 7, 401 

 Soredium, 234, 235 

 Sorus, 316, 324, 325, 3SS 

 Spadix, 411 

 Spathe, 410, 411 

 Spathyema, 412 



leaf structure, 41 

 Species, 146 



biological, 245 

 Sperm, 196, 275 

 Spermatophyta, 352 

 Sphaerella, 174, 175 

 Sphaeriales, 239, 240 

 Sphagnales, 296 

 Sphagnum, 296, 297, 299, 300 

 Spindle, of cell, 57, 58 

 Spiral leaf arrangement, 27, 28 

 Spirillum, 155 

 Spirogyra, 185, 186, 187 

 Spleenwort, 329 

 Spongy mesophyll, 9, 11, 21 

 Sporangia, 117, 150, 192, 224, 225, 



315. 325. 326 

 Spore, 115, 118, 151, 270 



differentiation of, 339 



germination of, 278, 300, 301, 



330,331, 338,349 

 Sporophylls, 115, 116, 117, 337, 338, 



379. 381 

 Sporophyte generation, 136, 194, 215, 



256, 281 

 Sporophyte, development of, 281, 

 286, 291, 293, 304, 310, 312, 318, 

 319. 332-334. 346, 359. 371. 395. 

 396. 399 

 Squash, leaf, 10 

 stem, 79, 80 

 Stamen, 115, 116, 379, 399 

 Staminodia, 421, 473 

 Standard, 451-453 

 Starch, 2, 12, 17, 18, 19 



test for, 14 

 Staurastrum, 188 

 Steironema, 473, 474 

 Stem, branches of, 99, 100 

 dicotyledon, 84, 90, 93 

 function of, 71 

 growth of, 89, 90, 91, 92, 93, 98, 99 



