INDEX 



597 



Nectar, 343. 



Nectary, 275 ; forms, 273. 



Nelumbium, 361. 



Nemalion, 305, 445, 446. 



Nepenthes, 76, 246, 547, 579. 



Nereocystis, 441. 



Nicotine, 109. 



Nidularia, 476. 



Nitella, 433, 434. 



Nitrates, 242. 



Nitrogen-conserving Bacteria, 408. 



Nitrogen fixation, 244. 



Node, 116. 



Nodules, 245. 



Nomenclature of groups, 392, 393. 



Nostoc, 399, 400. 



Nucellus, 274. 



Nucleolus, 41. 



Nucleo-protein, 105. 



Nucleus, 41. 



Nullipores, 445. 



Nut, 349. 



Nutrition without chlorophyll, 82. 



Nymphceaceoe, 546. 



Oak, 542 ; quartered, 126. 



Oats, temperature on growth, 158. 



(Edema, 234, 368. 



(Edogonium, 422, 423 ; ciliatum, 423 : 

 nodulosum, 423. 



(Enone latifolia, 458. 



(Enothera Lamarckiana, 551. 



Offsets, 188, 189. 



Oil, Castor, 104; Cottonseed, 104; 

 Linseed, 104 ; Olive, 104. 



Onagracece, 551. 



Onion Mold, 437. 



Onoclea sensibilis, 498. 



Oogonia, 416. 



Oomycetes, 435. 



Oospore, 397. 



Operculum, 488. 



Ophioglossales, described, 494. 



Ophioglossum vulgatum, 494* pro- 

 thallus, 495. 



Opium, 546. 



Optimum Habitats, 566. 



Opuntiales, described, 550. 



Orchid, 184; flowers, 538; pollina- 

 tion, 293; seeds, 372. 



Orchidaceous Epiphytes, 576. 



0rchidale8, described, 438. 



Orders, 392, 393. 



Organic Habitats, 560, 574. 



Oscillatoria, 399, 400. 



Osmoscope, 227, 228. 



Osmosis, described, 227, 232 ; ex- 

 planation, 230; phenomena, com- 

 mon, 235 ; pressure in growth, 

 233 ; pressures, 229 ; processes, 

 described, 232 ; uses in plants, 

 233, 234. 



Outgrowths from petals, 334. 



Ovarian wall, 351. 



Ovary, of Buckeye, 350; compart- 

 ments, 349 ; compound, 273 ; 

 described, 274 ; inferior, 275 ; 

 simple, 273 ; superior, 275 ; union 

 of carpels, 323. 



Ovule, 273, 323; described, 274; 

 forms, 272 ; Gymnosperm, 522 ; 

 to seed, 354 ; structure, 271, 277. 



Oxalophytes, 573. 



Oxygen, release by plants, 23. 



Paleobotany, 3. 



Palisade tissue, 30. 



Palm, 60, 127, 136, 532. 



Palmales, described, 532. 



Palmate venation, 66. 



Pampas, 585. 



Panama hats, 533. 



PandancUes, described, 529. 



Pandanus, 253, 567. 



Panicle, 337. 



Pansy seed, 376. 



Papaveracece, 546. 



Papaverales, described, 546. 



Papaya, 550. 



Papilionaceous, 548, 549. 



Papyrus, 572 ; antiquorum, 532. 



Parasite, 9, 11, 83; damage, 85. 



Parasitic Fungi, 367. 



Parietales, described, 550. 



Parks, 585. 



Parthenocarpy, 354. 



Parthenogenesis, 302. 



Pathology, 4, 367. 



Peach yellows, 369. 



Pearson Fern, 197. 



Peat, 241 ; Bogs, 486 ; Mosses, 485, 



572 ; uses, 487. 

 Pectin, 103. 

 Pediastrum, 418, 563. 

 Pedicel, 193. 

 Peduncle, 193. 

 Peg, of Pumpkin. 382. 

 Pendent Epiphytes, 577. 



