MORPHOLOGY, ANATOMY, AND PHYSIOLOGY. 



815 



Non-metallic elements of food, 710. 

 Non-nitrogenous organic substances, 



708. 



reserve material, 727. 

 Nucellus, 436, 526. 

 Nuclear disc, 119 (Fig. 77). 

 division, direct, 96 (Fig. 48). 



indirect, 97, 118 (Figs. 



77, 78, 82). 



Nucleo-hyaloplasm, 95. 

 Nucleolus, 93. 



Nucleus, 89, 93, 95, 96 (Fig. 47). 

 Nut, 530. 



Nutation, 742 (Fig. 478). 

 Nutritive properties of protoplasm, 



667. 

 Nyctitropic movements, 689 (Fig. 471). 



Obcordate, 54. 



Obdiplostemonous, 503 (Fig. 317). 

 Oblique leaf, 49. 



plane of flower, 499. 



zygomorphy, 10. 

 Obovate, 54. 

 Obtuse, 54. 



Ocrea, 48, 597 (Fig. 402). 

 Octant-wall, 329, 372. 

 Oidium-cells, 274, 289, 313, 767. 

 Oil-drops, 111, 459. 

 Oils, fixed, 708. 



volatile, 708. 

 Oily seeds, 112, 459, 725. 

 Oleic acid, 708, 724. 

 Olein, 708, 724. 

 Oligomery, 501. 

 Oligotaxy, 504. 



Ooblastema-filaments, 270, 299. 

 Oogamy, 225, 275. 



Oogonium, 83, 220, 228, 238 (Figs. 168. 



169), 249 (Fig. 178), 253 (Fig. 



181), 266 (Fig. 190), 276, 291 



(Fig. 202). 



Oosphere, 3, 81, 116, 225, 265 (Figs. 



190, 191), 277, 326, 377, 452. 

 Oospore, 3, 118,225, 275, 334, 377, 458. 

 Opening and closing of flowers, 744. 

 Operculum, 331, 341, 361, 368 (Fig. 



253). 



Opposite members, 25. 

 Optimum-temperature, 671. 

 Orbicular, 536. 

 Organs, 2. 



reproductive, 67, 188. 



vegetative, 37. 

 Organic acids, 708, 728. 

 Organised ferments, 723. 

 Origin of species, 780. 

 Orthostichy, 25, 26 (Figs. 14, 15). 

 Orthotropic members, 758. 

 Orthotropous ovule, 437 (Fig. 284). 

 Osmosis, 668, 700. 

 V. S. B. 



Ovary, 79, 433, 495. 



Ovate, 54. 



Ovule, 71, 189, 433. 



anatropous, 437 (Fig. 284). 



ascending, 525. 



campylotropous, 437 (Fig. 284). 



erect, 525. 



horizontal, 525. 



orthotropous, 437 (Fig. 284), 525 

 (Fig. 338). 



pendulous, 525. 



suspended, 525. 

 Oxalic acid, 708, 729. 

 Oxygen, 710, 712. 



absorption of, 722, 726. 



evolution of, 716 (Fig. 470 1. 



Palea of Composites, 662. 

 of Ferns, 395. 

 of Grasses, 545. 



Palisade-tissue, 163 (Fig. 125), 686. 

 Palmate, 50 (Fig. 30). 

 Palmatifid, 53 (Fig. 32). 

 Palmijie-fteidt 708. 

 Palmitin, 708. 

 Panicle, 493. 

 Pappus, 460, 660 (Fig. 462), 661 (Figs. 



464, 466). 

 Paracorolla, 515, 

 Paraheliotropism, 689, 748. 

 Paralinin, 95. 

 Paramylon, 111. 

 Paraphysis, 264 (Fig. 190), 299, 311, 



358, 392, 425. 



Parasites, iJ73, 589, 647, 711. 

 Parastichy, 27. 



Paratonic effect of light, 674, 744. 

 Parenchyma, 131, 163 (Fig. 125). 



functions of, 676. 

 Paripinnate, 52 (Fig. 32), 407. 

 Parthenogenesis, 87, 246, 771. 

 Partite, 54. 

 Passage-cells, 162. 

 Pedate, 50 (Fig. 30), 381. 

 Pedicel, 77, 490. 

 Pedicellate, 77. 

 Peduncle, 77. 

 Peg, 14. 

 Peloria, 512. 

 Peltate, 51 (Fig. 31). 

 Pentacyclic, 502. 

 Pentamerous, 500. 

 Peptones, 707, 725. 

 Perfoliate, 48 (Fig. 29). 

 Perianth, 76, 432. 



-leaves, 79, 494, 691. 

 Periblem, 146. 

 Pericambium, 167. 

 Pericarp, 112 (Fig. 70), 271, 529 (Fig. 



344). 

 Perichastial leaves, 85, 357. 



