INDEX. 



833 



Nitrogen in atmosphere, 

 291. 



— absorption of, 292, 384. 



— of parasites, 372. 



N itrogenous compounds,29i, 



345- 



— food of fungi, 384. 



— reserve-materials, 401. 



— substances in parasites, 

 &c., 372. 



Nocturnal position of floral 

 envelopes, 625, 642. 



— of leaves, 625-630, 634- 

 638, 646. 



Nodes, 128, 454. 



— geotropic curvatures of, 

 687, 688. 



Non-cellular Algse, 70, 365, 

 425, 492, 732, 734, 776. 



— plants, 109, 569. 



anisotropy of, 700. 



geotropismof, 679,680, 



697. 



growth of, 540, 543. 



heliotropism of, 697. 



Non - nitrogenous reserve- 

 materials, 332, 344, 400. 



— substances in parasites, 

 &c., 372. 



Non - sexual swarmspores, 



728, 733, 739. 

 Nojtoc, 392. 

 Nostocaceae, 107. 

 Nothochlsena, 186. 

 Nothoscordon fragrans, 86, 



104. 

 Nucellus of ovule, 465, 751, 



752, 754, 755, 760, 766. 

 Nuclear disc, 103. 



— division, loi. 



• — filaments, 102. 



— poles, 102. 



— spiniUe, 103. 



— substance, 206, 770. 

 Nuclei, 78, 86, 326. 



— crystalloids in, 335. 



— of pollen, 761, 771. 

 Nuclein, 87, 102, 109, 419, 



. 422, 770-772. 

 Nucleoli, 86-102. 

 Nucleoplasm, 87, 103. 

 Nucleus, 73, 77, 87, 319, 413, 



419, 422, 563, 645, 652, 



770. 



— of embryo-sac, 762. 



— of oosphere, 772. 

 Number of stomata, 251. 

 Nuphar, 126, 706. 

 Nutation, 546-548,671,672. 



— of stamens, 548. 



— of tendrils, 661, 664, 666, 

 667. 



— of twining plants, 669, 

 670. 



Nutrition, 190, 198, 282, 289, 

 292, 297, 302, 328, 366, 

 411. 



— of fungi, 367, 380-381, 



382, 383, 385, 389. 

 humus-plants, 374. 



— independent of growth, 

 411, 412. 



— of insectivorous plants, 

 374- 



— of parasites, &c., 368, 369, 



372. 

 Nutrition of schizomycetes, 

 384. 



— of yeast, 386. 

 Nutritive materials, 252, 282, 



287, 383, 508, 511, 512, 



579, 748, 753- 



— organs, 282. 



— salts in soil, 259, 262. 



— solution, 228, 284, 286, 

 291, 383. 



— substances, absorption of, 

 246, 264, 287, 366. 



Nycandra, 780. 

 Nyctaginese, 780. 

 Nymphsea, 706. 



— alba, 51, 642. 



— micrantha, 478. 



— stellata, 405. 

 NymphaEacese, 125. 



O. 



Oak, 43, 176, 204, 225, 229, 



288, 357, 388, 506, 507, 



510, 537, 581, 584, 704- 



galls, 204, 537. 



Oat, 338, 687. 



Object of fertilisation, 798. 



Oblique septa, 454. 



Occluded buds, 475. 



Octant-cells, 446, 743, 764. 



Odours, 184, 



CEdogonium, 33,604, 787, 788. 



— 33, 82. 



— fertilisation of, 775, 776. 

 CEnanthe phellandrium, 130. 

 (Enotbera, 640. 

 CEnotherae, 780, 



Oidium, 786. 

 Oil, 319. 



— of bitter almonds, 342. 



— of mustard, 342. 

 Oleander, 52, 312. 

 Oncidium microchilum, 789. 

 Onion, 43, 59, 62, 3'°, 333, 



335, 350, 357, 546, 572, 

 689. 



— 701. 



Onorpordon acanihium, 405. 

 Oogonia, 724, 732, 733, 734, 



736, 772, 775-778, 788, 



789. 



Oosphere, 98, 108, 447, 465, 

 480, 484, 538, 605, 724, 

 730, 731, 732, 734, 736, 

 737, 742, 747, 749-751, 

 754, 755, 760, 764, 767- 

 778, 780, 788, 789, 800. 



Oospore, 734, 743, 762, 766, 

 767, 800. 



Opening and closing of 

 flowers, 599, 641. 



of stomata, 249. 



— of flower-buds, 397. 

 Operculum, 739. 

 OphioglossesE, 472. 

 Ophioglosium, 478. 



— vulgatum, 37. 

 Ophrydeae, 24. 

 Ophrys, 43, 332. 

 Opium, 172. 



Optimum point for light, 195, 



302. 

 forevolution of oxygen, 



306. 



— — for temperatures, 192, 



395- 



— velocity of growth, 552, 

 560. 



Opuntia, 54, 7°, I59, 5", 

 517, 518, 519, 520, 522, 



527. 



— crass a, Si?- 



— Ficus-indica, 51 7- 



518. 



Opuntiae, 181. 

 Orache, 299. 

 Orange, 183, 329,802. 

 Orange light, 303, 638, 696, 



697. 

 Orchideae, 62, 367, 369, 538, 



660, 763, 789, 791. 

 Orchids, 25, 114, 177, 433, 



778. 



— pollination of, 796, 797. 



— saprophytic, 63. 

 Orchis, 180. 



Organic acids, 329, 385. 



— centre of organs, 482. 



— compounds, 206. 



— substance, 226, 289, 290, 



293, 323, 355, 366, 422. 



— nutritive materials, ab- 

 sorption of, 366. 



— substance, absorption of, 

 298, 368, 374. 



— substance destroyed in 

 respiration, 400. 



— substance, formation of, 

 296. 



origin of from starch, 



326. 



Organic substances, physio- 

 logical significance of, 

 329. 



Organisation, 509, 510, 704. 



