INDEX. 



819 



644-656, 678, 689, 692, 

 695, 717. 

 Irritability, definition of, 

 587. 



— of growing leaves, 640. 



— law of, 196. 



— of plants and animals, 597, 

 600. 



— of protoplasm, 587, 599, 

 603, 615, 616, 617, 620, 

 621, 655. 



— of roots to contact, 716. 



— of swarmspores to light, 

 608, 6ro-6i2. 



— of tendrils, 658-666. 



— andturgescence,647,653. 



— of twining stems, 674, 



675. 



— uses of, 655, 656. 

 Isoetese, 745. 



Isoetes, 471, 483, 748, 756. 



— hystrix, 57. 



— lacustris, 749, 771. 

 Isosporous Vascular Crypto- 

 gams, 739. 



Ivy, 12, 24, 42, 56, 522, 523, 

 657, 658, 660, 693, 699, 

 703, 710-712, 713. 



— 182, 523. 



Jalap, 180, 

 Jasminium, 669. 

 Jerusalem artichoke, 59. 

 Juglandeae, 465. 

 Juncus, 145, 219. 

 Jungermannieae, 66, 474, 476. 

 Juniper, 703. 

 Juniperus, 321. 



— communis, 703. 

 164. 



K. 



Kerria, 177. 

 Kidney Bean, 194. 

 Klinostat, 201, 562, 683, 



.685, 693, 705, 717- 



— 684, 716. 



movements, 673. 



Knight's experiment, 682. 



L. 



Labellum, 796. 



Labiatese, 496, 501, 713, 780, 



794- 

 Lactic acid, 349, 386. 



— fermentation, 349. 

 Lagenarta, 658. 



Lamina, 47, 471, 489, 490, 

 506, 507, 547, 623, 626- 

 630, 633, 640, 650, 693, 

 705. 



Laminaria, 32, 69, 208, 242, 

 429. 



— Claustoni, 32, 70. 

 Lamium ampkxicaule, 791. 

 Lamp-light and assimilation, 



307. 

 Land-plants, 203, 253, 295, 

 511, 512. 



— absorption by, 283. 



— leaves of, 47-53. 



— roots of, 246, 255. 



— transpiration of, 225, 246. 



— vascular bundles of, 44. 

 Larch, 584. 



— 498. 



Lateral buds, 508, 714. 



— roots, 17, 416, 476, 699, 

 704, 705. 



geotropism of, 707, 



708. 

 Laterality, 481, 485. 

 Latex, 172, 180, 362. 



— extrusion of, 361. 

 cells, 174. 



vesicles, 179. 



Lathrma, 14, 63, 374, 399. 



— squamaria, 335. 

 Lathyrus alphaca, 660. 

 Laticiferous vessels, 171,174, 



361. 



pressures on, 360. 



Laurineae, 180. 



Law of irritability, 196. 



Laws of cell-division, 434, 



435, 442, 454, 456, 502. 



— of hybridisation, 780- 



784- 

 Layers of wood, 161. 

 Laying of wheat, 289, 514. 

 Leaf, carpellary, 758. 



— development of, 425, 469, 



475, 506, 744- 



— primary, 747, 764. 



— primordial, 506. 



— upper, 506. 



base, 471, 506. 



buds, 397. 



nectaries, 281. 



sheath, 418, 687. 



• tendrils, 659, 660. 



traces, 157. 



Leaflets, 626, 629, 633, 639, 

 644, 646. 



Leaves, 4, 38, 39, 47, 282, 

 290, 343, 418, 424, 448, 

 454, 455, 464, 467, 482, 

 483, 487, 489, 490, 492, 

 494, 504, 506, 510, 513, 

 520, 528, 547, 564, 567, 

 569, 575, 625, 626, 627, 

 633, 640, 644, 699, 705. 



— absorption of water by, 

 254. 



of gases by, 255, 



3 G 2 



Leaves, area of, 227, 312, 



511,513. 



— arrested, 55, 61, 506, 507, 



— autumn, 318, 319. 



— and bud-scales, correla- 

 tions between, 506. 



— chlorotic, 298. 



— climbing, 675. 



— colours of in winter, 321. 



— compound, 52, 425, 490, 

 687. 



— decomposition of carbon- 

 dioxide by, 298. 



— development of buds 

 from, 478. 



— evaporation of water 

 from, 227, 246. 



— fall of, 319. 



— floating, 51,5"- 



— greening of, 285, 298, 301, 



309, 533- 

 301. 



— growth of, 419, 422, 540. 



— importance to flowers, 



534- 



— influence of light on, 617, 

 621, 623-640. 



on structure of, 5 3 6. 



— irritability of growing, 

 640. 



— mechanics of, 49. 



— metamorphosed, 464. 



■ — metamorphoses of, 536. 



— motile organs of, 623- 

 646, 689. 



— negatively heliotropic,7o i . 



— periodic movements of, 

 623, 627, 628, 635, 636, 

 640. 



— protection of, 50. 



— quantity of starch pro- 

 duced in, 314. 



— radical, 421. 



— regeneration from, 721, 

 723, 582. 



— respiration of, 400. 



— as reservoirs of reserve- 

 materials, 331. 



— and roots, correlations 

 between, 512, 513. 



— scale-, 504, 506, 507. 



— scale-like, 63. 



— sessile, 53. 



— sensitive, 641-649, 655. 



— sheathing, 470. 



— sleep-movements of, 199, 

 623, 626-629, 635-640. 



— structure of, 490, 491. 



— submerged, 511. 



— tensions in, 49. 



— vascular bundles of, 47- 



53- 



— venation of, 48,49, 51, 



128, 511. 



