INDEX 



569 



Olive, 452. 



Onagraceae, 441, 447. 



Oncidium, 397, 504, 541 ; 0. ornithorhyn- 



chum, Fig. 472. 



Onion (Allium), 26, 61, 316, 372. 

 Onion-mould (.see " Peronospora ") . 

 Onion-smut (see "Urocystis "). 

 Onoclea sensibilis, 251, 273, 543, Fig. 215. 

 Ontogeny, 3'2, (>(>. 

 Oogonium, 30, 94, 121, 132, 137. 

 Oomycetes, 152. 

 Oosporeae, 107. 

 Opening of flowers, 486. 

 Operculum, 233, 234, 236. 

 Ophioglossaceae, 258, 2(56, 274, 532. 

 Ophioglossum, 2(52, 263, 267, 268; 0. pen- 

 dulum, Fig. 232; 0. vulgatum, Fig. 



232. 



Opuntia, 440. 

 Opuntiales. 424, 440, 447. 

 Orange, 59, 358, 436. 

 Orchid, Orchidaceae, 22, 349, 359, 363, 370, 



371, 378, 380, 395, 396, 397, 468,504, 



523, 539, 540, 541. 

 Orchis, 39(5,521,523; 0. spectabilis, Figs. 



373, 491. 



Oreodoxa, 375; O. regia, 387, 541. 

 Organic acids, 180, 474, 479. 

 Organic bodies, 1. 

 Organography, 10. 

 Ornithophily, 516, 524. 

 Orobanchaceae, 458. 

 Orobanche, 453, 476. 

 Orthotropous ovule, 354. 

 Osage-orange (Maclura) , 419. 

 Oscillaria (see "Oscillatoria"). 

 Oscillatoria, 8, 20, 80, 82, 83, 496, Fig. 56. 

 Oscillatoriaceac, 81, 83, 84. 

 Osmunda, 30, 199, 246, 248, 250, 251, 257, 



258, 274, 275; O. cinnamomea,Figs. 



215, 216, 241 : 0. Claytoniana, Figs. 



25, 207, 217, 240; 0. reaalis, Fig. 240. 

 Osmundaceaj, 273, 274, 275, 279, 532. 

 Ostrya, 417. 

 Ovary, 325, 349, 351. 

 Ovule, 22, 27, 32, 284, 317, 323, 324, 328, 



329, 338, 339, 349, 351, 352, 354. 

 Oxalic acid, 53, 474, 479. 

 Oxalidaceas, 436, 444, 486. 

 Oxalis, 27, 424, 434,436,491; 0. Bowei, 



Fig. 462; O. violacea, Figs. 19, 425. 

 Oxidation, 7, 13. 



Oxydendrum arboreum, 449, Fig. 438. 

 Oxygen, 7, 12, 38, 42, 473, 476. 



Palese, 29, 258, 384. 



Palaeophytology (see "Geological distri- 

 bution," " Fossil plants"). 



Palaeozoic age, 245. 

 Palaeozoic formations, 319, 331, 346. 

 Palisade-parenchyma, 259. 

 Pallavicinia, 19!), 213; P. decipiens, !!>!; 



P. cylindrica, Fig. 172. 

 Palmella-stage of Algae, 5, 101. 

 Palmetto (Sabal), 386, 540, 541, 545. 

 Palms, Palmae, (5, 8, 29, 327, 369, 370, 373, 



374, 375, 376, 378, 380, 381, 384, 380, 



387, 481, 514, 536, 538, 540, 541. 

 Pancratium, 391. 

 Pandanacefe, 378, 383, 384. 

 Pandauales, 381, 383. 

 Pandanus, 28, 375, 376, 384. 

 Pandorina, 64, 97. 

 Pangens, 37, 38, 44. 

 Pansy ( Viola tricolor) , 517. 

 Papaver (Poppy), 367, 424, 429, 490. 

 Papaveraceae, 429, 444. 

 Papaya, 440. 

 Papayineae, 447. 

 Papilionaceae, 433, 434. 

 Pappus, 456. 

 Papyrus, 385. 

 Paracholesterine, 39. 

 Paramoecium, 509. 

 Paraphyses, 166, 172. 

 Parasites, 3, 7, 26, 29, 76, 149, 150, 163, 



167, 174, 188, 348, 362, 404, 453, 475, 



505, 506. 



Parenchyma, 56, 57. 

 Parietales, 424, 439, 446. 

 Parkeriacese, 273, 280. 

 Parthenogenesis, 94, 122, 291; Chara 



crinita, 122 ; Marsilia, 291. 

 Passifloraceae, 439, 447. 

 Passion-flower (Passiflora), 439; P. in- 



carnata, Fig. 433. 

 Pastinaca sativa, 442, Fig. 437. 

 Pathogenic Bacteria, 76. 

 Paulownia, 453. 



Paulownia imperialis, 30, Fig. 22. 

 Pea, 54, 360, 368, 477, Fig. 35. 

 Peach, 359, 3(58, 433. 



Pea-family (see also " Leguminosae "), 26. 

 Pear, 433. 



Peat-mosses (see also "Sphagnum "), 201. 

 Pedaliaceae, 458. 

 Pediastrum, 14, 98, 100, Figs. 3, 68 ; P. 



Boryamim, Fig. 68. 

 Pelagic Diatoms, 88, 497. 

 Pelargonium, 25, 29, 405, 412, 436, 516, 



517, 520, Figs. 16, 384, 484. 

 Pellia, 46, 213, 215 ; P. epiphylla, growth 



of seta, 215. 

 Penaeaceae, 447. 

 Penicillium, 169, 170; P. glaucitm, 169, 



Fig. 135; P. crustaceum, Fig. 135. 



