INDEX 
Root, elongation of, 25. 
Root, fleshy, 37, 38. 
Root-cap, 35, *36. 
Root-climbers, 56. 
Root-hair, *27, #387, *46, *47, 
Root-pressure, *47, 48. 
Root-section, *86, *87. 
Root-system, 39. 
Roots, absorbing surface of, 39-41. 
Roots, adventitious, 30, *31. 
Roots, aérial, 30, *31. 
Roots, fascicled, *34. 
Roots, fibrous, *34. 
Roots, growth of, 25. 
Roots, movements of young, 40, 41. 
Roots, parasitic, 82, *33. 
Roots, primary, *14, 30. 
Roots, propagation by, 42. 
Roots, selective action of, 46, 47. 
Roots, storage of food in, 37-89. 
Roots, structure of, 34-38*. 
Roots, water, 31, 32. 
Rootstock, *58, *59. 
Russian thistle, *198, 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, *801. 
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. 
aTT 
Secondary growth, 71-74*. 
Secondary root, 30. 
Sections, leaf, 127, *128. 
Sections, root, *86, *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, 12, 
#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, #857. 
Sexual generation, 237. 
Shoot, 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, paealishiyeined leaf 
of, *101. 
Sori, *281. 
Spatulate, App. I, *3565. 
Species, 207, 208. , 
