INDEX 



597 



Nucellus, 38, 448, 454, 35*, 36*, 38*, 

 449*, 455*. 



Nuclear membrane, 114, 114*. 



Nuclear sap, 114, 114*. 



Nucleolus, 114, 114*. 



Nucleoproteins, 282. 



Nucleus, 39; described, 114, 114*; 

 endosperm, 40, 44, 51; of leaf 

 cell, 251, 251*; primary en- 

 dosperm nucleus, 40, 38*, 39*; 

 tube, 42, 42*. 



Nut type of fruit, 80, 81*. 



Nux vomica, 286. 



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



plain sawed, 203*; quartersawed, 



203*; uses, 476, 477*. 

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



Smut, 393. 



Objections to Darwinism, 522. 

 Oedogonium, 312, 312*. 

 Oenothera, rubrinervis, 525 ; gigas, 525, 



525*; nanella, 525; Lamarckiana, 



524,524*. 



Oils, 274; fatty, 283; volatile, 285. 

 Onion, section of root, 144*; section 



of bulb, 181*; seedling, 107, 



105*. 



Onodea 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 acids, 287. 

 Organic evolution, 560. 

 Origin of Species, 562. 

 Orthotropous ovule, 463. 

 Oryzenin, 282. 

 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 

 seeds, 37. 



Ovulate strobilus, of Cycads, 446, 

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



Oxalic acid, 287. 



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, 164, 164*. 

 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 family, 484-486. 

 Pea type of seedling, 109, 110*. 

 Pear Blight, 348, 348*. 

 Peat, 154. 



