INDEX 



217 



Radish, 32, 41. 

 Raspberry, 137.' 

 Red color, 65-70. 

 Red maple, 5, 6. 

 Reproduction, 131-137. 

 Respiration, 184, 185. 

 Rliacliis, 56. 

 Rhizoids, 50, 141. 

 Rhubarb, 65, 102. 

 Rock societies, 206. 

 Root-cap, 42, 43. 

 Root-hairs, 31-36, 89. 

 Roots, 24-53. 

 Runners, 21, 137. 



Salix, 15. 



Salt, 18, 157. 



Saprophytes, 77. 



Sarracenia, 78. 



Saxifrage, 200. 



Scaly buds, 116. 



Scouring rush, 13, 



Scutellum, 168. 



Seaweeds, 26. 



Seed-coats, 158, 159, 167, 172, 177. 



Seeds, 21, 131, 154-181. 



Sensitiveness, of roots, 36-43. 



of stems, 127-129. 



of tendrils, 126, 127. 

 Shellac, 44. 

 Shrinkage, of leaves, 12. 



of roots, 27. 

 Silicon, 13, 16, 123. 

 Silks, 166. 



Sleeping buds, 118, 119. 

 Slime moulds, 2. 

 Smilax, 171. 

 Societies, 191-201. 

 Sodium, 16, 17, 18. 

 Soil, composition of, 30, 31. 

 Sorghum, 19. 

 Species, 6. 



Spectrum of chlorophyl, 60. 

 Spines, 122. 



Spirogyra, 53, 209. 



Spongy layer, 45. 



Spores, 21, 52, 131, 139, 140, 141, 



142, 145, 149, 184. 

 Sporophyte, 142-146. 

 Spring beauty, 148. 

 Squash, 26, 126. 

 Starch, 19, 154. 

 Stems, 93-129. 

 Stigma, 147. 

 Stilt roots, 29. 

 Stinging hairs, 122. 

 Stolons, 137. 

 Stomata, 55, 82. 

 Storage in roots, 48. 

 Strawberries, 90, 137, 138. 

 Struggle for existence, 124, 125. 

 Styles, 147. 



Sugar, 18, 19, 35, 36, 65; 66, 106. 

 Sugar maple, 4, 5, 6, 154, 184. 

 Sulphur, 16. 

 Sumach, 56, 58. 

 Sunflower, 12, 24, 26, 33, 100, 109, 



131. 

 Sweet potato, 132, 133. 

 Sycamore, 4, 110. 



Tannins, 19. 



Temperature, 89-92, 154, 195. 



Tendrils, 126, 127. 



Thallus, 128, 197. 



Thistle, 1, 123, 205. 



Thorns, 122. 



Tissues, 22, 23. 



Toadstools, 51, 201. 



Tobacco, 90. 



Tomato, 25, 34, 40, 45, 67, 83, 96, 



103. 

 Touch-me-not, 102. 

 Transplanting, 89. 

 Transpiration, 81-85, 88, 89. 

 Tubers, 133, 134. 

 Tulip tree, 68. 

 Turnip, 11. 



