4S8 



INDEX 



Seed plants, 132, 137, 312 



Seed testing, 294 



Seedless fruits, 9, 294 



Seedling, of bean, 152; of Indian 

 corn, 165 ; of squash, 3 



Seeds, 281-294, 333 



Selaginella, no 



Selection, 360, 363-366, 371 



Self-fertilization, 105 



Self-pollination, 148, 276, 280 



Sensitive plant, 250-252 



Sepals, 7-9, 142, 148, 151, 260 



Sex organs, of fern, 103, 104; of 

 moss, 86, 88 



Sexual generation, of fern, 102, 103, 

 107 ; of moss, 85-89, 93 ; of pine, 

 124, 125, 128 



Sexual reproduction, 48, 57, 63, 66 



Shaggy mane (mushroom), 81 



Shrubs, 189 



Silk of Indian corn, 159, 161, 163 



Sleep movements, 140, 252 



Slime molds, 373, 377 



"Smilax," 203 



Smuts, 83, 385-387 



Solomon's seal, 199 



Soy bean, 317 



Spawn, mushroom, 78 



Specialized races, 69 



Spermatia, 60, 62, 63, 73 



Spices, 323 



Spike, 265 



Spikelets of Indian corn, 159-161 



Spirillum, 17 



Spirillum of recurrent fever, 16, 17 



Spirogyra, 39-49, 57, 59 



Spore formation, advantages, 58 



Spore leaves, 122, 142 



Spore sacs, of bread mold, 54, 56, 

 58; of fern, loi, 102; of moss, 

 87, 90-92 



Spores, of bacteria, 11, 15, 20, 21, 

 36; of bread mold, 55-58; of 

 bread mold, germination, 56 ; of 

 fern, loi, 102; of fern, germina- 

 tion, 102 ; of moss, 92 ; of moss. 



germination, 92 ; of mushrooms, 

 77, 79, 81-83; of mushrooms, 

 distribution, 77; of mushrooms, 

 germination, 78; of rusts, 60-68, 

 70-72, 83 ; of rusts, germination, 

 64-66, 71 ; of yeasts, 36 



Sporodinia, 59 



Sports, 368 



Spring wood, 117, 209 



Spruce, white, 134 



Spurge family, 305 



Spurges, 338 



Squashes, 1-4, 10 



Squirrel-tail grass, 330 



Stamens, 8, 9, 141, 143, 161 ; rudi- 

 mentary, 9, 159, 160 



Starch, 42, 164, 246, 247 



Stem, of bean, 137, 138, 187; of 

 cucumber, 4; of fern, 97, 98, 99, 

 106; of Indian corn, 156, 157; 

 of moss, 87; (trunk) of pine, 113- 

 119 



Stems, 186-227 



Sterilization of mUk, 20 



Stimulants, 319 



Stimuli, 183-185, 218, 240 



Stipules, 139, 229 



Storage in roots, 176 



Strains, plus and minus, 57 



Strawberry, 283 



Streptococcus pyogenes, 16 



Sugar beet, 315 



Sugar cane, 315 



Sugar-producing plants, 315 



Sugars, 36, 42, 164, 246, 247, 315 



Summer wood, 117, 209 



Sundews, 237 



Sunflower, 193 



Support of plants by roots, 174-176 



Tap roots, 121, 130 



Tape-grass, 266, 267 



Tassel of Indian corn, 159, 161 



Tea, 318 



Tendrils, 5, 6, 205, 236 



