MORPHOLOGY, ANATOMY, AND PHYSIOLOGY 



815 



Non-metallic elements of food, 710. 

 Non-nitrogenous organic substances, 

 708. 

 reserve material, 727. 

 Nucellus, 430, 520. 

 Nuclear disc. 111) (Fig. 77). 



division, direct, 90 (Fig. 48). 



indirect, 97, 118 (Figs. 

 77, 78, 82). 

 Nucleo-byaloplasm, 95. 

 Nucleolus, 93. 



Nucleus, 89, 93, 95, 9G (Fig. 47>. 

 Nut, 530. 



Nutation, 742 (Fig. 478). 

 Nutritive properties of protoplasm, 



667. 

 Nyctitropic movements, 089 (Fig. 471). 



Obcordate, 54. 



Obdiplostemonous, 503 (Fig. 317). 

 Oblique leaf, 49. 



plane of flower, 499. 

 zygoraorpby, 10, 

 Obovate, 54. 

 Obtuse, 54. 



Ocrea, 48, 597 (Fig. 402). 

 Octant-wall, 329, 372. 

 Oidium-cells, 274, 289, 313, 707. 

 Oil-drops, 111, 459. 

 Oils, fixed, 708. 



volatile, 708. 

 Oily seeds, 112, 459, 725. 

 Oleic acid, 708, 724. 

 Olein, 708, 724. 

 Oligomerj', 501. 

 Oligotaxy, 504. 



Ooblastema-filaments, 270, 299. 

 Oogamy, 225, 275. 

 Oogonium, 83, 220, 228, 238 (Figs. 1(;8. 



109), 249 (Fig. 178), 253 (Fig. 



181), 2(50 (Fig. 190), 270, 291 



(Fig. 202). 

 Oosphere, 3, 81, 110, 225, 205 (Figs. 



190, 191), 277, 320, 377, 452. 

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

 Opening and closing of flowers, 744. 

 Operculum, 331, 341, 301, 308 (Fig. 



253). 

 Opposite members, 25. 

 Optimum-temperature, 071. 

 Orbicular, 530. 

 Organs, 2. 



reproductive, «)7, 188. 

 vegetative, 37. 

 Organic acids, 708, 728. 

 Organised ferments, 723. 

 Origin of species, 780. 

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

 Orthotropic members, 768. 

 OrtbotropouB ovule, 437 (Fig. 284). 

 Osmosis, 008, 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, 720. 



evolution of, 716 (Fig. 475). 



Palea of Compositss, 002. 



of Ferns, 395. 



of Grasses, 545. 

 Palisade-tissue, 163 (Fig. 125), 680. 

 Palmate, 50 (Fig. 30). 

 Palmatifid, 53 (Fig. 32). 

 Palmitic acid, 708. 

 Palmitin, 708. 

 Panicle, 493. 

 Pappus, 460, 600 (Fig. 462), 661 (Figs. 



464, 400). 

 P-aracorolla, 515. 

 Paraheliotropism, 689, 748. 

 Paralinin, 95. 

 Paramylon, 111. 

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



358, 392, 425. 

 Parasites, 273, 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, 64. 

 Passage-cells, 162. 

 Pedate, 50 (Fig. 80). 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, 091. 

 Periblem, 140. 

 Pericambium, 107. 

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



344). 

 Perichaetial leaves, 85, 357. 



