INDEX 



579 



dosperm nucleus, 40, 38*, 39*; 



tube, 42, 42*. 

 Nut type of fruit, 80, 81*. 

 Nux vomica, 283. 



Oak, family, 476; flowers, 476, 470*; 



plain sawed, 203*; quarter sawed, 



203*; uses, 476, 477*. 

 Oat, flower, 20, 20*, 21*; kernel, 66; 



Smut, 393. 

 Objections to Darwinism, 522. 

 Oedogonium, 312, 312*. 

 Oenothera, brevistylis, 530; gigas, 



530, 530*; laevifolia, 530; La- 



marckiana, 529, 529*. 

 Oils, 273; fatty, 279; volatile, 281. 

 Onion, section of root, 144*; section 



of bulb, 181*; seedling, 107, 105*. 

 Onoclea sensibilis, 431, 431*. 

 Ontogeny, 291. 

 Oogonium, 312, 312*. 

 Oospore, 302. 

 Open bundles, 195. 

 Opening of buds, 205, 205*. 

 Optimum temperature for germina- 

 tion, 90. 

 Orchid, family, 499; flowers, 26, 25*, 



499*. 

 Order, in classification, 291. 

 Organ, 6; essential organs of flowers, 



11; sex, 302. 

 Organism, 6. 

 Organic evolution, 513. 

 Origin oj Species, 517. 

 Orthotropous ovule, 463, 

 Oryzenin, 281. 

 Oscillatoria, 298, 298*. 

 Osmosis, 94; as related to cell activity, 



117; described, 116, 116*. 

 Osmotic pressure, 119. 

 Osmunda Claytonia, 431, 431*. 

 Ovary, 33, 33*, 34*; inferior, 15, 15*; 



structure, 34, 34*, 35*, 36*; 



superior, 16, 15*. 

 Ovules, 34, 34*, 35*, 36*; of Angio- 



sperms, 463; of Cycads, 448, 



448*, 449*; cellular structure, 39, 



39*; development to seeds, 43, 



43*, 44*, 45*; of Pines, 454, 454*, 



455*; parts, 38, 38*; relation to 



seed.s, 37. 

 Ovulate strobilus, of Cycads, 446, 



447, 448*; of Pines, 453, 454*. 

 Oxalic acid, 285. 

 Ox-eye Daisy, 86. 

 Oxygen, for germination, 92; in 



respiration, 121, 269. 



Palea, 17, 18*, 19*. 

 Paleobotany, 3. 

 Palisade tissue, 249, 250*. 

 Palmaceae, 497, 

 Palm family, 497. 

 Pandorina, 304, 305*. 

 Panicle, 23, 32; of Oats, 120*. 

 Papain, 284. 

 Papaw, 284. 

 Pappus, 26, 24*. 



Parallel-veined leaves, 245, 244*. 

 Paraphysis, 365, 366*. 

 Parasite, 337. 

 Parasitic roots, 163, 163*. 

 Parenchyma cells, 127. 

 Parsley family, 488. 

 Parthenocarpic fruits, 50. 

 Parthenogenesis, 355, 467. 

 Parthenogenetic fruits, 50, 

 Parthenocarpy, 467. 

 Parts, of a flower, 11, 11*; of a leaf, 

 234; of a pistil, 33; of a plant, 6, 

 Pathogenic Bacteria, 346, 347*. 

 Pea famUy, 484-486. 

 Pea type of seedling, 109, 110*, 

 Pear Blight, 348, 348*, 

 Peat, 154. 

 Peat Moss, 422. 

 Pectic substances, 276. 

 Pediastrum, 309, 308*. 

 Pediastrum boryanum, 308*. 

 Pedicels, 20, 20*. 

 Pedigree cultm-e, 560. 

 Penicillium, 375; described, 376, 376*. 

 Pepo type of fruit, 79, 78*. 

 Pepsin, 94. 

 Peptases, 284. 

 Peptones, 284. 



