496 



INDEX. 



Multiplication of species not indefi- 

 nite, 115. 



Murchison, Sir R., on the forma- 

 tions of Russia, 301. 

 on azoic formations, 318. 

 on extinction, 326. 



Murie, Dr., on the modification of 

 the skull in old age, 166. 



Murray, Mr. A., on cave-insects, 

 125. 



Mustela, vision, 155. 



Myanthus, 411. 



Myrmecocystus, 255. 



Myrmica, eyes of, 256. 



Nageli, on morphological charac- 

 ters, 191. 

 Nails, rudimentary, 442. 

 Nathusius, Von, on pigs, 178. 

 Natural History, future progress 



of, 470. 

 Natural Selection, 69. 

 Natural system, 404. 

 Naturalization of forms distinct 

 from the indigenous species, 

 96. 

 Naturalization in New Zealand, 182. 

 Naudin, on analogous variations in 

 gourds, 140. 

 on hybrid gourds, 285. 

 on reversion, 288. 

 Nautilus, Silurian, 317. 

 Nectar of plants, 81. 

 Nectaries, how formed, 81. 

 Nelumbium luteum, 383. 

 Nests, variations in, 230, 252, 259. 

 Neuter insects, 256, 257. 

 Newman, Col., on humble-bees, 



65. 

 New Zealand, productions of, not 

 perfect, 182. 

 naturalized products of, 343. 

 fossil birds of, 345. 

 glaciers of, 371. 

 crustaceans of, 374. 

 algae of, 374. 



number of plants of, 385. 

 flora of, 393. 

 Newton, Sir I., attacked for irreli- 



gion, 466. 

 Newton, Prof. , on earth attached to 



a partridge's foot, 363. 

 Nicotiana, crossed varieties of, 286. 



pertain species very sterile, 269. 

 JNjfcsche, Dr., on ttye Polyzoa, 214. 



Noble, Mr., on fertility of Rhodo- 

 dendron, 264. 

 Nodules, phosphatic, in azoic 

 rocks, 318. 



Oaks, variability of, 45. 



Onites appelles, 122. 



Ononis, small imperfect flowers of, 



192. 

 Orchids, fertilization of, 173. 



the development of their flowers, 

 217. 



forms of, 411. 

 Orchis, pollen of, 169. 

 Organization, tendency to advance, 



109. 

 Organs of extreme perfection, 160. 



electric, of fishes, 167. 



of little importance, 175. 



homologous, 423. 



rudiments of, and nascent, 440. 

 Ornithorhynchus, 92, 406. 



mammas of, 211. 

 Ostrich not capable of flight, 200. 



habit of laying eggs together, 239. 



American, two species of, 352. 

 Otter, habits of, how acquired, 155. 

 Ouzel, water, 159. 

 Owen, Prof., on birds not flying, 

 121. 



on vegetative repetition, 133. 



on variability of unusually de- 

 veloped parts, 133. 



on the eyes of fishes, 163. 



on the swim-bladder of fishes, 165. 



on fossil horse of La Plata, 326. 



on generalized form, 335. 



on relation of ruminants and 

 pachyderms, 335. 



on fossil birds of New Zealand, 

 345. 



on succession of types, 345. 



on affinities of the dugong, 405. 



on homologous organs, 425. 



on the metamorphosis of cephal- 

 opods, 431. 



Pacific Ocean, faunas of, 352. 



Pacini, on electric organs, 169. 



Paley, on no organ formed to give 

 pain, 181. 



Pallas, on the fertility of the do- 

 mesticated descendants of wild 

 stocks, 266. 



Palm with hooks, 177, 



