836 



Water-nut, 351. 

 702. 



— of organisation, 79, 206. 

 plants, 126, 155, 203, 227, 



232, 253, 255, 287, 297, 

 511,512. 



— • — absorption by, 247. 



— of respiration, 395, 400. 



— river-, 288. 



— sea-, 287, 288. 



— in soil, 257, 258, 259. 

 stomata, 119, 279. 



— in tendrils, 665. 



— theory of ascent of, 238, 



241. 

 ■^ transpiration of, 227, 246. 



— velocity of movements of, 

 236, 254. 



— well-, 288. 



— in wood, 239, 267, 269. 

 Wave-lengths of light, 306. 

 Wax, 117, 172, 246, 329. 

 Weeping of plants, 266, 279. 



— of root-stock, 270, 277. 

 Weight, dry- of seedlings, 



, &C -. 564, 567, 573. 

 "-^ loss of by respiration, 300, 



313, 327, 400, 403. 

 f ' "" of in germination, 400. 



— of wood, 240. 



— of yeast-cell, 384, 386. 

 Welijuitschia mirabilis, 178. 

 178. 



Wheat, 262, 263, 334, 337, 

 339, 397, 687. 



— 20, 260, 261, 483, 688. 



— laying of, 289, 514. 

 -^ Smut of, 381. 

 White Bryony, 658. 

 659, 663. 



— Mustard, 261, 711, 

 693. 



Whorl, 470, 483, 486, 495, 



500. 

 Wild vine, 658, 663. 

 Willow, 218, 505, 578, 784. 

 Wintetjfbuds, 42, 43, 351, 



366, 464, 506, 507. 



INDEX. 



Winter-leaves, 321. 



— -rest, 197. 



Witches'-brooms, 203, 537. 

 Wood, 131, 161, 218, 229, 



266, 312, 314, 320, 335, 

 359, 444, 482, 5", 574, 

 575, 579, 58i. 

 ■ — air in, 238, 267, 268. 



— aqueous vapour in, 268. 



— area of cell- walls of, 241. 



— autumnal, 230, 268, 578. 



— bleeding of, 266. 



cells, 238, 267, 274, 288, 



329, 439- 



— — suction of, 269. 

 volume of, 239. 



— composition of, 290. 



— conductibility of, 243. " 



— desiccation of, 242. 



— -destroyingfungi, 344,381, 

 387. 



— destruction oj by fungi, 

 388. 



fibres, 160, 578. 



— filtration through, 237. 



— functions of, 163, 231. 



— heart-, 230, 268. 



— imbibition of, 241, 268. 



— molecular structure of, 

 242. 



— porosity of, 238. 



— properties of, 234, 243, 

 264, 



— -skeletons, 159. 



— specific gravity of, 240. 



— spring, 230, 268, 578. 



— structure of, 237, 439. 



■ — tension of air in, 267, 268, 

 269,-270. 



— tensions and pressures in, 

 574-580; 



— tissues of, 158. 

 vessels, 160. 



— water in, 239, 241, 267, 

 269. 



sorrel, 329,620,625,638, 



644, 649, 656. 

 Woodwardia radicans, 478. 



Woolly hairs, 124. 

 Work done by growing- 

 plants, 583. 



X. 



Xylem, 131, 157, 230. 



— general characters, 133. 



parenchyma, 160. 



rays, 159. 



— of roots, 168. 

 Xylogen, 88, 389. . 



Yeast, I, 76, 324, 343, 347, 

 369, 383, 384, 385, 387. 



. cell, weight and volume 



of, 384, 386. 



— cultivation of, 384, 



fungi, 349, 385. 



Yellow autumn leaves, 319. 



— bacteria, 386. 



— fruits, 320. 



— light, 303, 311,638,696, 

 697. 



— wood, 163. 

 Yew, 237, 751, 756. 

 Yucca, t^^, 528, 571, 



— gloriosa, 529. 



Z. 



ZeaMays, 118, 130, 236, 283. 

 38, 42, 79, 91, HI, 



132,141,145,232,338, 



421, 469. 



Zinc in soil and plants, 288. 

 Zones of growth, 541, 544, 



685.- 

 Zoosperm, 724, 730, 768- 



771,780, 788. 

 Zoo-spores, 82, 604. 



— movements of, 604-608. 

 Zygomycetes, 726. 

 Zygospore, 351, 725, 726, 767, 



800. 

 Zygote, 725-729, 767, 800. 



THE END. 



