INDEX 



409 



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, *132. 

 Schizomycetes, 232. 

 Schizophycese, 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, 233. 

 Seed-plants, classes of, 233. 

 Seeds, containing poisons, 24. 

 Seeds, dispersal of, 377-386*. 

 Selection, natural, 395. 



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, 232. 



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, *243, 



244. 



Sporangium, 287, *288. 

 Spore, 235, *236. 



