INDEX. 



265 



Sphagnum-bogs, 208. 



Sphagnum-moors, 188. 



Spines, 146, 204. 



Spirogyra, 110. 



Spongy tissue, 39, 40. 



Spore case, 55, 118, 119. 



Spore-dispersal, 109, 111, 112, 113, 



114, 118. 

 Spores, 109, 110, 111,112. 

 Spring beauty, 196. 

 Spring plants, 143, 144. 

 Squash seedlings, 50. 

 Squirting cucumber, 120. 

 Staghorn fern, 100. 

 Stamens. 78, 79, 80, 125. 

 Starch. 153. 

 Star cucumber, 61. 

 Star-of-Bethlehem, 81. 

 Stem, 54, 83, 139. 

 Steppes, 216. 

 Stigma, SO, 125. 

 Stipules, 35. 

 Stomata, 38, 40, 206. 

 Strawberry plant, 57, 58. 93. 

 Struggle for existence, 142. 

 Style, SO, 125. 

 Subterranean stems, 54, 55, 56, 76, 



77, 78. 

 Succulent plants, 222. 

 Sugar, 153. 

 Sundew, 158. 159. 

 Sunflower. 72. 

 Swamp-forest, 190. 191. 

 Swamp-moors, 187. 

 Swamp-thickets, 188. 

 Swamps, 183. 



Tamarack, 178, 190. 

 Tap root, 93. 

 Tax us, 42. 



Teasel, 136. 



Telegraph plant, 49. 



Temperature, 145. 



Tendrils, 61, 62, 63. 



Thallus, 107. 



Thickets, 188, 224, 243. 



Thistle, 117. 



Thorns, 146, 204, 205, 206, 207, 



224. 

 Thuja, 139. 

 Tilia, 116, Jul. 

 Tillandsia, 96, 101. 

 Toad-flax, 80. 

 Toadstools, 149. 

 Tobacco, SO. 

 Touch-me-not, 119. 

 Tragacanth, 206. 



Transpiration, 31, 33, 154, 193, 256. 

 Tropical forest, 254. 

 Trumpet creeper, 99. 

 Tubers, 74, 76, 196. 

 Tumbleweeds, 117, 220. 

 Turf-building, 185. 



U 



Ulex, 205. 

 Ulothrix, 109, 111. 

 Utricularia, 173, 174. 



Vallisneria. IS4. 



Vascular bundles, 83, 84, 92, 93, 



94. 107, 108, 151. 171. 

 Vegetative multiplication, 109. 

 Veins, 35, 36, 37, 40, 151. 

 Velamen, 99. 

 Venation, 35, 36, 37. 

 Victoria, 180. 

 Violet, 117, 119. 



