INDEX 



545 



AVater, absorption by roots, 7-9 



\Vater. amount transpired, 18 



AVater, movement of, 9, 11, 80 



AVater ferns, 290*, 291* 



Water lily, flower of, 105* 



Water molds, *217-219 



A\'ater plants, *47;i-481 



AYater plants, leaves of, 67*, 68 



AA'ater roots, 30 



AVater storage, 74, 75 



AA'ater supply, 169, 174, 177, 205, 



206 

 AA'ater supply in soils, 439-441 

 AVebber, H. J., 430 

 AVeeds, -«4(i-j-476 

 AA'eeds, aquatic, 471 

 AA'eeds, classes of, 465, 466 

 AA'eed.s, dissemination of, 472-474 

 AA'eeds, injuries caused by, 470-472 

 AVeeds, origin of, 473 

 AVeeds, prevention of, 475, 476 

 AA'eeds, success of, 466-468 

 AMieat, hybridizing of, 428*, 429* 

 AVlieat breeding, 413-417 

 AA'heat culture, 457 

 AA'heat grain, section of, 138*, 139* 

 AA^heat rust, *242-245 

 ■AVhite pine, distribution map, 504« 

 AA'ild ginger, 58* 

 AVilliams, C. G., 423 

 AAlllow, flowers of, 106*, 107* 

 AVilting of corn leaves, 6*, 20 

 AVind pollination, 120 



AA'inged fruits and seeds, 160*, 151* 



tt'inter buds, 90* 



AVinter spores of wheat, rust, *24:!- 



245 

 AA^ood, coniferous, 304, 390* 

 AA'ood, fuel value of, 395 

 AA'ood, physical properties of, 392- 



395 

 AA'ood, structural advantages of , 394, 



395 

 AA'ood, structure of, 45*, 46*, 48*, 



*50-53 

 AA'ood, tracheids of, 48*. 391 

 AA'ood fibers, 48 



AA'ood sections, 50*, 63*, *390-392 

 AA'ood sorrel, leaf positions of, 65* 

 AVoodbine, 61* 



Xerophytes, 480, *481-487 



A'arrnw, head and flower of, 369* 



Yeast, 232*, 233 



A'ellow fever, 163 



Yellow pond lily, transitions between 



petals and stamens of, 105* 

 Yucca, 509* 

 Yucca, pollination of, 127, 128*, 129* 



Zamia, 317 

 Zoospores, 191 

 Zygnema, 204* 

 Zygomorphic, 108, 109* 

 Zygospore, 194 



