INDEX 



461 



Style, 138. 



Substratum, 69. 



Subterranean stems, 245. 



Summaries, Algae, 30 ; Angio- 

 sperms, 148 ; Bryophytes, 87 ; 

 dispersal and germination of 

 seeds, 185 ; the flower and 

 insect-pollination, 165 ; food- 

 manufacture, 39 ; Fungi, 64 ; 

 Gymnosperms, 128 ; leaves, 

 222 ; plant associations, 289 ; 

 Pteridophytes, 112; roots, 

 269 ; stems, 251. 



Sundew, 220, 221. 



Surgery, 451. 



Swamp forest, 281. 



Sweet corn, 350. 



Sweet pea, 406; pollination of, 

 160. 



Sweet potato, 375, 376. 



Sympetalous, 133, 154. 



Tap-root, 255. 



Tendrils, 216, 217, 246. 



Testa, 127, 167, 317. 



Thallophytes, 6, 8, 40, 114. 



Thorns, 217, 245. 



Tillage, 312. 



Toadflax, 133. 



Tobacco, flower of, 132. 



Tomato, 383. 



Toxic substances, 305. 



Tracheary vessels i 237. 



Transfer form, 36. 



Transpiration, 195. 



Tropical forest, 288. 



Tube nucleus, 141. 



Tuber, 249, 369; potato, 328. 



Tulip, 409. 



Tumbleweed, 172. 



Turgor, 10. 

 Turnips, 373, 374. 



U 



Ulothrix, 15, 16, 21, 23. 



Vascular bundles, 237. 

 Vascular cylinder, 93, 94, 236. 

 Vascular system, 89. 

 Vaucheria, 27, 28. 

 Vegetables, 367. 

 Vegetative multiplication, 18. 

 Vegetative propagation, 326. 

 Veins, 90, 195. 

 Venus fly-trap, 222. 

 Viability, 318. 



Violet, 405 ; seed of a, 317 ; seed- 

 discharge, 168. 



W 



Water, 302 ; movement of, in 

 soil, 314. 



Watermelon, 385. 



Water roots, 266. 



Water storage, 208. 



Wheat, 354, 355, 356. 



Wheat-production, map show- 

 ing states of greatest, 364. 



Wheat rust, 51, 52. 



Wild wheat, 355. 



Wilts, 446. 



Wood, 237. 



Woodbine, 234, 235. 



X 



Xerophytes, 279. 

 Xylem, 89, 237. 



