498 
INDEX. 
MONKEYS. 
Monkeys, fossil, 304* 
Monocanthus, 424. 
Mons, Van, on the origin of fruit-trees, 
29. 
Moquin-Tandon on sea-side plants, 132. 
Morphology, 433. 
Mozart, musical powers of, 209. 
Mud, seeds in, 386. 
Mules, striped, 165. 
Muller, Dr. F., on Alpine Australian 
plants, 375. 
Murchison, Sir R., on the formations 
of Russia, 290. 
-, on azoic formations, 308. 
-, on extinction, 317. 
Mustek vison, 179. 
Myanthus, 424. 
Myrmecocystus, 239. 
Myrmica, eyes of, 240. 
N. 
Nails, rudimentary, 454. 
Natural history, future progress of, 
485. 
-selection, 80. 
■-system, 413. 
Naturalisation of forms distinct from 
the indigenous species, 115,. 
-in New Zealand, 201. 
Nautilus, Silu^;ian, 307. 
Nectar of plants, 92. 
Nectaries, how formed, 92. 
Nelumbium luteum, 387. 
Nests, variation in, 211. 
Neuter insects, 236. 
Newman, Mr., on humble-bees, 74. 
New Zealand, productions of, not per¬ 
fect, 201. 
-, naturalised products of, 337. 
-, fossil birds of, 339. 
-, glacial action in, 373, 
-, crustaceans of, 376. 
-, algae of, 376. 
-, number of plants of, 389. 
-, flora of, 399. 
Nicotiana, crossed varieties of, 271. 
-, certain species very sterile, 257. 
Noble, Mr., on fertility of Rhododen¬ 
dron, 252. 
Nodules, phosphatic, in azoic rocks, 
308. 
PEAR. 
0 . 
Oak, varieties of, 50, 
Onites apelles, 135. 
Orchis, pollen of, 193. 
Organs of extreme perfection, 186. 
-, electric, of fishes, 192. 
-of little importance, 194. 
-, homologous, 434. 
-, rudiments of, and nascent, 450. 
Ornithorhynchus, 107, 416. 
Ostrich not capable of flight, 134. 
-, habit of laying eggs together, 
218. 
-, American, two species of, 349. 
Otter, habits of, how acquired, 179. 
Ouzel, water, 185. 
Owen, Prof., on birds not flying, 134. 
-, on vegetative repetition, 149. 
-, on variable length of arms in 
ourang-outang, 150. 
-, on the swim-bladder of fishes, 
191. 
-, on electric organs, 192. 
-, on fossil horse of La Plata, 319. 
-, on relations of ruminants and 
pachyderms, 329. 
-, on fossil birds of New Zealand, 
339. 
-, on succession of types, 339. 
-, on affinities of the dugong, 414. 
-, on homologous organs, 434. 
-, on the metamorphosis of cephalo- 
pods and spiders, 442. 
P. 
Pacific Ocean, faunas of, 348. 
Paley on no organ formed to give pain, 
201 . 
Pallas on the fertility of the wild 
stocks of domestic animals, 254. 
Paraguay, cattle destroyed by flies, 72. 
Parasites, 217. 
Partridge, dirt on feet, 363. 
Parts greatly developed, variable, 150. 
-, degrees of utility of, 201. 
Parus major, 184. 
Passiflora, 251. 
Peaches in United States, 85. 
Pear, grafts of, 262. 
