INDEX 



377 



Root, elongation of, 25. 



Root, fleshy, 37, 38. 



Root-cap, 35, *36. 



Root-climbers, 56. 



Root-hair, *27, *37, *46, *47. 



Root-pressure, *47, 48. 



Root-section, *36, *37. 



Root-system, 39. 



Roots, absorbing surface of, 39-41. 



Roots, adventitious, 30, *31. 



Roots, aerial, 30, *31. 



Roots, fascicled, *34. 



Roots, fibrous, *34. 



Roots, growth of, 25. 



Roots, movements of ■young, 40, 41. 



Roots, parasitic, 32, *33. 



Roots, primary, *14, 30. 



Roots, propagation by, 42. 



Roots, selective action of, 46, 47. 



Roots, storage of food in, 37-39. 



Roots, structure of, 34-38*. 



Roots, water, 31, 32. 



Rootstock, *58, *59. 



Russian thistle, *193, 205. 



Russian thistle, spread of, 205. 



Rust, 224-228*. 



Rust, wheat, study of, 226-228*. 



Sac fungi, 250-255*. 

 Sago-palm, 82. 

 Salver-shaped, *152. 

 Salvinia, *301. 

 Sap, descent of, 78, 80, *81. 

 Sap, rise of, 78-80. 

 Saprophytes, 139, 233. 

 Sapwood, 74, 78. 

 Scalloped, App. I, *357. 

 Scion, *75. 

 Sclerenchyma, 66. 

 Seasonal plants, 114. 



Secondary growth, 71-74*. 

 Secondary root, 30. 

 Sections, leaf, 127, *128. 

 Sections, root, »36, *37. 

 Sections, wood, *70, *73. 

 Seed, 4-21*. 

 Seed-leaf, *5, 6, 24. 

 Seed-plants, 209, 211. 

 Seed-plants, classes of, 211. 

 Seedlings, 22-29*. 

 Seedlings, mutilated growth of, 1 2, 



*13. 

 Seeds, containing poisons, 21. 

 Seeds, dispersal of, 191-199*. 

 Selaginella, 291, 292. 

 Selection, artificial, 310-315. 

 Selection, natural, 206. 

 Selective absorption, 44. 

 Self-pollination, 168. 

 Sepal, 143, 146, 148. 

 Separated flowers, 150, *157. 

 Serrate, App. I, *357. 

 Sexual generation, 237. 

 Slioot, 25. 

 Shrubs, 54. 



Sieve-cells, *69, *70, *72, 78. 

 Silica, 135, 250. 

 Simple leaves, 103. 

 Simple pistil, 154. 

 Simple umbel of cherry, App. I, 



*358. 

 Sinuate, App. I, *357. 

 Sleep of leaves, *109, *110. 

 Slime-molds, *297. 

 "Smilax," *62. 

 Solomon's seal, parallel-veined leaf 



of, *101.. 

 Sori, *281. 



Spatulate, App. I, *355. 

 Species, 207, 208. 



