456 



GENERAL BOTANY 



Roots, tap, 4*, 356* 



Kootstock of Solomon's seal, 354 



Rosa (rose), 406 



Rosaceae, 403-410 



Rose, flower structure of, 405* 



Rubus (raspberries and blackberries), 



405 



Runners, 354 

 Runners of Rhizopus, 261 

 Runners of strawberry, 155 

 Rusts, 274-275* 



Sachs, experiment by, 33* 

 Sachs, Julius von, 31, 59 

 Sagittaria, 429* 

 Salicaceae, 387-390 

 Salix discolor, 388 

 Salma, bark of, 105 

 Salvia, cortex of, 105 

 Salma, stem structure of, 105, 106*, 107 

 Salma, summary of structure of, 108 

 Salma, vascular cylinder of, 105, 106* 

 Samara, 364*, 365, 390* 

 Saprolegnia, 282 

 Saprophytes, 242 

 Sapwood, 86 

 Sassafras, wood of, 381* 

 Scale, ovuliferous, 332 

 Scales of bud, 68* 

 Scape of dandelion, 40, 41*, 42 

 Scars, bud-scale, 69*, 84* 

 Schizomycetes, 250 

 Schleiden, M. J., 55, 56 

 Schultze, Max, 56 

 Schwann, 55 

 Seasonal life, 125 

 Seasonal life, summary of, 135 

 Seasonal life of Adiantum, 300 

 Seasonal life of annual, 126-130 

 Seasonal life of bean, 129* 

 Seasonal life of biennial, 130, 131*, 132 

 Seasonal life of perennial, 133*, 134 

 Secondary roots, 356* 

 Sedges, 430 

 Seed, 165*, 166, 169* 

 Seed of mandrake, 165 

 Seed of mandrake and spruce, 349 

 Seed of pea, 24* 

 Seed of spruce, 335* 

 Seed production in forest, 373 

 Seedling of bean, 4*, 129* 

 Seedling of mandrake, 166 

 Seedling of pea, 24* 

 Seedling of spruce, 335* 

 Selaginella, 317*-320 

 Selaginella, gametophytes and embryo 

 of, 319* 



Selaginella, life history of, 320* 

 Selaginella, sporangia and spores of, 



318* 



Selection, plant improvement by, 192 

 Selection in corn, 194* 

 Selection of fluctuating variations, 



208-210 



Selection of mutations, 210 

 Selection in tobacco, 198* 

 Self-fertilization, 174 

 Self-pollination, 167 

 Sepals, 161 



Serrate leaf margin, 355* 

 Seta of moss, 293, 295* 

 Sexual reproduction, 159 

 Shasta daisy, 182, 183 

 Shull, George H., and corn crossing, 179 

 Shull and seedlings of CEnothera la- 



marckiana, 202* 

 Sieve plates, 92, 93*, 305* 

 Sieve tubes, 92, 93*, 305* 

 Silique, 363*, 365, 400* 

 Silver grain of wood, 88-90 

 Simple pistils, 363* 

 Sinuate leaf margin, 355* 

 'Skeletal tissue, 86*, 301* 

 Skeleton of plants, 49 

 Smilacina, 420 

 Smilacina, root structure, 62 

 Smilacina stellata, 421* 

 Smuts, 276, 277* 

 Soil, composition of, 141* 

 Soil and root hairs, 140*, 141* 

 Solitary flowers, 357* 

 Solute, 137* 

 Solvent, 138 



Sori, 274, 275*, 306*, 307* 

 Sorus of fern, 306, 307* 

 Spadix, 426* 

 Spanish needles, 413 

 Spathe, 426* 

 Spatulate leaf, 355* 

 Spiderwort (Tradescantid), 417* 

 Spike, 358* 

 Spikelet, 433* 

 Spindle, 75*, 76 



Spiral, leaf arrangement, 15*, 16* 

 Spiral flowers, 358 

 Spirogyra, 223-229 

 Spirogyra, 'fertilization discovered in, 



57 



Spirogyra, life history of, 229 

 Spirogyra, reproduction in, 227* 

 Spirogyra, structure of, 224*, 225* 

 Spongy tissue of leaf, 115* 

 Sporangiophore of Equisetum, 312*. 



313* 



