INDEX 
Schizomycetes, 210. 
Schizophycee, 210. 
Scion, *75. 
Sclerenchyma, 66. 
Scouring-rush, study of, 249-251*. 
Seasonal plants, 114. 
Secondary growth, 71-74*. 
Secondary root, 30. 
Sections, leaf, 127, *128. 
Sections, root, *36 
Sections, wood, #70, *73, 
Seed, 4-21*. 
Seed-leaf, *5, 6, 24. 
Seedlings, 22-20%, 
Seedlings, mutilated growth of, 12, 
#13. 
Seed-plants, 209, 211. 
Seed-plants, classes of, 211. 
Seeds, containing poisons, 21. 
Seeds, dispersal of, 191-199*. 
Selection, natural, 206. 
Selective absorption, 44. 
Self-pollination, 168. 
Sepal, 143, 146, 148. 
Separated flowers, 150, *157. 
Series, plants form a, 257. 
Serrate, App., *265. 
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., *266. 
Sinuate, App., *265. 
Sleep of leaves, *109, *110. 
“« Smilax,’’ *62. 
Snowflake, pollen tube of, with 
generative cells, 165. 
281 
Solomon’s seal, parallel-veined leaf 
of, *101. 
Sori, #244, 245. 
Spatulate, App., *263. 
Species, 207, 208. 
Spike, App., *266. 
Spine, 1238-125*. 
Spirogyra, study of, 215-217*. 
Sporangium, *244, 246. 
Spore, 212, 216, #217, #218, #224, 
*225, #227, #230, #244, 
Spore-capsules, 238, #239. 
Spore-cases, #223. 
Spore-plants, 210. 
Spore-plants, classes of, 210. 
Sporophyll, 251. 
Sporophyte, 238, *239, 240, #244, 
246, 248, 252. 
Spruce, fertilized ovule of, #260. 
Squash seed, 4-5*. 
Squash seed, section, *5. 
Squash seedling, 23, 24. 
Stamen, *153. 
Stamen, parts of, *153. 
Standard, *150. 
Starch, 15-18*, 82, 138-140. 
Starch disappears during germina~ 
tion, 18. 
Starch in leaves, 138, 139. 
Starch, testing seed for, 15, 16. 
Stem, 49-85%. 
Stem, definition of, 49. 
Stem, dicotyledonous, annual, gross 
structure of, 67-69*. 
Stem, dicotyledonous, minute 
structure of, 69, 70. 
Stem, early history of, *71. 
Stem, functions of cells of, 77, 78. 
Stem, monocotyledonous, *65, 66, 
67. 
