436 



Introduction to Botany. 



Virginia creeper, T3, 186 ; effect of darkness 

 OD, 113; experiment witli tendrils of, 103. 

 Viscid disk, 190. 



Walnut, 207. 



Water, cross pollination by, 178 ; demonstra- 

 tion of region of rise of, 29, 53 ; current, 

 diagram to show, 99 ; effect of submerg- 

 ence in, 307 ; importance of, 37 ; effect of 

 scarcity of, 306. 



Water lily, 140. 



Water plants, roots of, 40. 



Water supply, 306. 



Wild cucumber, tendrils of, 103. 



Willow, 177; adventitious roots of, 44; Cre- 

 taceous, 355. 



Wind, adaptation to, 177. 



Winds, effect of, 314. 



Winter buds, protection afforded, 67. 

 Wood, use of, 56. 



Xeropbytes, 319 ; character of, 822 ; North 



American, 321 ; origin of, 326. 

 Xerophytic conditions, 320. 

 Xylem, diagram to show, 58, 91 ; function of, 



51. 



Teast, culture of, 256 ; in alcoholic fermenta- 

 tion, 263; in bread-making, 262; nature 

 of, 261 ; reproduction of, 262. 



Yucca, 147 ; arboreus, 321 ; cross pollination 

 of, 196-201 ; in twilight, 198. 



Zilla spinosa, 345. 



Zygophyllum cornutum, 322, 323. 



LIST OF PLANTS STUDIED IN CHAPTER X. 



Alexander, golden, 233. 



Arkansas rose, 236. 



Chickasaw plum, 234. 



Cottonwood, 230. 



Crowfoot, small-flowered, 231. 



Dandelion, 248. 

 Dog's-tooth violet, 221. 

 Dutchman's breechea, 232, 



Evening primrose, 247. 



Fleabane, 250. 

 Flower-de-luce, 224 



Golden Alexander, 233. 



Grass, star, 223 ; blue-eyed, 223. 



Ground plum, 237. 



Indian turnip, 219. 



Jack-ln-the-Pulpit, 219. 



Lady's slipper, 227. 

 Larkspur, 281. 



Maple, 23S. 



Milkweed, common, 248. 



Naias, slender, 218. 



Plum, Chickasaw, 284; ground, 237. 

 Primrose, evening, 247. 



Eose, Arkansas, 236. 



Shepherd's purse, 283. 

 Slender Naias, 218. 

 Small-flowered crowfoot, 281. 

 Star grass, 223. 

 Strawberry, Virginia, 235. 



Violet, 239 ; dog's-tooth, 221. 

 Violet wood sorrel, 238. 

 Virginia strawberry, 235. 



Willow, 229. 



Wood sorrel, violet, 238. 



