INDEX . 
Round-leafed mallow, stamens and 
pistils of, 364. 
Russian thistle, *379. 
Russian thistle, spread of, 394. 
Rust, 259. 
Rust, wheat, study of, 259-262*. 
Rye grass, 76. 
Sage, pollination in flowers of, 
*365, *366. 
Sago-palm, 113. 
Salver-shaped, *202. 
Salvinia, *302. 
Sap, descent of, *109, 110. 
Sap, rise of, 107, 108, *109. 
Saprophytes, 169, 269. 
Sapwood, 105. 
Scalloped, *152. 
Schizomycetes, 232. 
Schizophycez, 232, *238. 
Scirpus, cross-section of stem of, 
*84, 
Sclerenchyma, 84. 
Scouring-rush, study of, 292—295*. 
Seasonal plants, 311. 
Secondary growth, *96, *97, *100. 
Secondary root, 36. 
Secondary roots, direction of, 59. 
Sections, leaf, *151, *154. 
Sections, root, *42, *44. 
Sections, wood, *100, *101, *102. 
Sedge, rootstock of, *76. 
Seed, 5-24. 
Seed-leaf, *6, 7. 
Seedlings, 25-35. 
Seedlings, mutilated growth of, 14. 
Seed-plants, 231, 235. 
Seed-plants, classes of, 233. 
Seeds, containing poisons, 24. 
Seeds, dispersal of, 577-386*. 
Selection, natural, 395. 
409 
Selective absorption, 53, 54. 
Self-pollination, 353. 
Sepal, 197. 
Separated flowers, 199, 200, *201. 
Sequoia, *66, 71, *106. 
Series, plants form a, 300. 
Serrate, *132. 
Sexual generation, 278. 
Shade plants, *321. 
Shoot, 30. 
Shrubs, 69, 70. 
Sieve-cells, *93, 110. 
Sieve-plate, *93. 
Sieve-tubes, *93. 
Silica, 165, 241, 294. 
Simple leaves, 137. 
Simple pistil, 202. 
Simple umbel of cherry, *187. 
Sinuate, *132. 
Sleep of leaves, *144, *145. 
Slime-fungi, 252. 
Slime moulds, 178, *179, 180, 181, 
*236, 237. 
‘¢ Smilax,’’ 79, *81. 
Snowflake, pollen tube of, with 
generative cells, *214. 
Solomon’s seal, parallel-veined leaf 
of, *136. 
Soredia, 271. 
Sori, 261, 287, *288. 
Spatulate, *131. 
Species, 229. 
Spermagones, 271. 
Spermatia, 271. 
Spike, 188. 
Spine, *347, *348, *350. 
Spiral vessel, *92. 
Spirogyra, study of, 241, 242, *245, 
244. 
Sporangium, 287, *288. 
Spore, 235, *236. 
