498 



INDEX. 



MONKEYS. 



PEAR. 



Monkeys, fossil, 303. 





Monocanthus, 424. 



0. 



Mons, Van, on the origin of fruit-trees, 



29, 39. 



Oak, varieties of, 50. 



Moquin-Tandon on sea-side plants, 132. 



Onites apelles, 135. 



Morphology, 434. 



Orchis, pollen of, 193. 



Mozart, musical powers of, 209. 



Organs of extreme perfection, 186. 



Mud, seeds in, 386. 



, electric, of fishes, 192. 



Mules, striped, 165. 



of little importance, 194. 



Miiller, Dr. F., on Alpine Australian 



, homologous, 434. 



plants, 375. 



, rudiments of, 450. 



Murchison, Sir R., on the formations 



Ornithorhynchus, 107, 416. 



of Russia, 289. 



Ostrich not capable of flight, 134. 



, on azoic formations, 307. 



, habit of laying eggs together, 



, on extinction, 317. 



218. 



Mustela vison, 179. 



, American, two species of, 349. 



Myanthus, 424. 



Otter, habits of, how acquired, 179. 



Myrmecocystus, 238. 



Ouzel, water, 185. 



Myrmica, eyes of, 240. 



Owen, Prof., on birds not flying, 134. 





, on vegetative repetition, 149. 



N. 



, on variable length of arms in 





ourang-outang, 150. 



Kails, rudimentary, 453. 



, on the swim-bladder of fishes, 



Natural history, future progress of, 



191. 



484. 



, on electric organs, 192. 



selection, 80. 



, on fossil horse of La Plata, 319. 



— — system, 413. 



, on relations of ruminants and 



Naturalisation of forms distinct from 



pachyderms, 329. 



the indigenous species, 115. 



, on fossil birds of New Zealand, 



in New Zealand, 201. 



339. 



Nautilus, Silurian, 306. 



, on succession of types, 339. 



Nectar of plants, 92. 



, on affinities of the dugong, 414. 



Nectaries, how formed, 92. 



, on homologous organs, 435. 



Nelumbium luteum, 387. 



, on the metamorphosis of cephalo- 



Nests, variation in, 212. 



pods and spiders, 442. 



Neuter insects, 236. 





Newman, Mr., on humble-bees, 74. 



P. 



New Zealand, productions of, not per- 



fect, 201. 



Pacific Ocean, faunas of, 348. 



, naturalised products of, 337. 



Paley on no organ formed to give pain, 



, fossil birds of, 339. 



201. 



, glacial action in, 373. 



Pallas on the fertility of the wild 



, crustaceans of, 376. 



stocks of domestic animals, 253. 



, algse of, 376. 



Paraguay, cattle destroyed by flies, 72. 



, number of plants of, 389. 



Parasites, 217. 



, flora of, 399. 



Partridge, dirt on feet, 362. 



Nicotiana, crossed varieties of, 271. 



Parts greatly developed, variable, 150. 



, certain species very sterile, 257. 



, degrees of utility of, 201. 



Noble, Mr., on fertility of Rhododen- 



Parus major, 183. 



dron, 251. 



Passiflora, 251. 



Nodules, phosphatic, in azoic rocks, 



Peaches in United States, 85. 



307. 



Pear, grafts of, 261. 



