Seite - 548 - in The Origin of Species

548 INDEX Naudin, on hybrid gourds, 325. , on reversion, 328. Nautilus, Silurian, 359. Nectar of plants, 106. Nectaries, how formed, 106. Nelumbium luteum, 430. Nests, variations in, 266, 289, 296. Neuter insects, 293, 294. Newman, Col., on humble-bees, 88. New Zealand, productions of, not perfect, 213. , naturalised products of, 387. , fossil birds of, 389. , glaciers of, 418. , crustaceans of, 420. , algae of, 421. , number of plants of, 432. , flora of, 441. Newton, Sir I., attacked for irre- ligion, 520. , Prof., on earth attached to a partridge's foot, 409. Nicotiana, crossed varieties of, 326. , certain species very sterile, .307. Nitsche, Dr., on the Polyzoa, 248. Noble, Mr., on fertility of Rhodo- dendron, 303. Nodules, phosphatic, in azoic rocks, 360. O Oaks, variability of, 67. Onites apelles, 148. Ononis, small imperfect flowers of, 224. Orchids, fertilisation of, 204, 205. , the development of their flowers, 251. -, forms of, 461. Orchis, pollen of, 200. Organisation, tendency to advance, ^ 135. Organs of extreme perfection, 190. , electric, of fishes, 199. , of little importance, 205. , homologous, 474. , rudiments of, and nascent, 490. Ornithorhynchus, 118, 454. , mammas of, 245. Ostrich not capable of flight, 233. —— , habit of laying eggs together, 274. -, American, two species of, 397. Otter, habits of, how acquired, 184. Ouzel, water, 189. Owen, Prof., on birds not flying, 147- , on vegetative repetition, 160. , on variability of unusually developed parts, 161. —— , on the eyes of fishes, 193. , on the swim-bladder of fishes, 196. on fossil horse of La Plata, 369. Owen, Prof., on generalized form, 378. , . , on relation of ruminants and pachyderms, 378. -, on fossil birds of New Zea- land, 388. , on succession of types, 389. , on affinities of the dugong, 453- , on homologous organs, 473. , on the metamorphosis of cephalopods, 482. Pacific Ocean, faunas of, 397. Pacini, on electric organs, 199. Paley, on no organ formed to give pain, 213. Pallas, on the fertility of the do- mesticated descendants of wild stocks, 305. Palm with hooks, 208. Papaver bracteatum, 226. Paraguay, cattle destroyed by flies, 86. Parasites, 274, 275. Partridge, with ball of earth at- tached to foot, 409. Parts greatly developed, variable, i6i. Parus major, 188. Passiflora, 302. Peaches in United States, 98. Pear, grafts of, 311. Pedicellariae, 247. Pelargonium, flowers of, 157. , sterility of, 303. Pelvis of women, 156. Peloria, 157. Period, Glacial, 411. Petrels, habits of, 189. Phasianus, fertility of hybrids, 304. Pheasant, young, wild, 269. Pictet, Prof., on groups of species suddenly appearing, 356. , on rate of organic change, 365. on continuous succession of genera, 367. , on change in latest tertiary forms, 350. , on close alliance of fossils in consecutive formations, 383. -, on early transitional links, 355. Pierce, Mr., on varieties of wolves, 103. Pigeons with feathered feet and skin between toes, 30. , breeds described, and origin of, 37- , breeds of, how produced, 52, 53- tumbler, not being able to get out of egg, 100. , reverting to blue colour, 170. , instinct of tumbling, 268.