450 



ON THE ORIGIN OF SPECIES 



Modification of species, how far 

 applicable, 435. 



Moles, blind, 124. 



Mongrels, fertility and sterility 

 Of, 240. 



and hybrids compared, 244. 



Monkeys, fossil, 272. 



Monocanthus, 3S2. 



Mons, Van, on the origin of fruit- 

 trees, 27. 



Moquin-Tandon on sea-side plants, 

 120. 



Morphology, 390. 



Mozart, musical powers of, 188. 



Mud, seeds in, 347. 



Mules, striped, 149. 



Miiller, Dr. F., on Alpine Aus- 

 tralian plants, 337. 



Murchison, Sir R., on the forma- 

 tions of Russia, 259. 



on azoic formations, 275. 



on extinction, 285. 



Mustela vison, 161. 



Myanthus, 382. 



Myrmecocystus, 214. 



Myrmica, eyes of, 216. 



Nails, rudimentary, 408. 

 Natural history, future progress 



of, 436. 



selection, 73. 



system, 372. 



Naturalisation of forms distinct 



from the indigenous species, 



104. 



in New Zealand, 181. 



Nautilus, Silurian, 275. 

 Nectar of plants, 83. 

 Nectaries, how formed, 84. 

 Nelumbium luteum, 34S. 

 Nests, variation in, 190. 

 Neuter insects, 212. 

 Newman, Mr., on humble-bees, 68. 

 New Zealand, productions of, not 



perfect, 181. 



naturalised products of, 302. 



fossil birds of, 304. 



glacial action in, 335. 



crustaceans of, 337. 



algae of, 337. 



. number of plants of, 350. 



flora of, 359. 



Nicotiana, crossed varieties of, 



243. 

 certain species very sterile, 



231. 



Noble, Mr., on fertility of Rhodo- 

 dendron, 226. 



Nodules, phosphatic, in azoic 

 rocks, 276. 



Oak, varieties of, 47. 



Onites apelles, 122. 



Orchis, pollen of, 174. 



Organs of extreme perfection, 167. 



electric, of fishes, 173. 



of little importance, 175. 



homologous, 390. 



rudiments of, and nascent, 



404. 

 Ornithorhynchus, 97, 375. 

 Ostrich not capable of flight, 122. 

 habit of laying eggs together 



196. 

 American, 



314. 

 Otter, habits of, 



162. 

 Ouzel, water, 166. 

 Owen, Prof., on birds not flying, 



122. 



on vegetative repetition, 135. 



on variable length of arms in 



ourang-outang, 136. 

 on the swim-bladder of fishes, 



172. 



— on electric organs, 173. 



on fossil horse of La Plata, 



two species of, 

 how acquired, 



286. 



on relations of ruminants and 



pachyderms, 295. 



on fossil birds of New Zea- 

 land, 304. 



on succession of types, 304. 



on affinities of the dugong, 



373. 



on homologous organs, 390. 



- on the metamorphosis of 



cephalopods and spiders, 397. 



Pacific Ocean, faunas of, 313. 

 Paley on no organ formed to give 



pain, 181. 

 Pallas on the fertility of the wild 



stocks of domestic animals, 228. 

 Paraguay, cattle destroyed by 



flies, 6*7. 

 Parasites, 196. 

 Partridge, dirt on feet, 826. 

 Parts greatly developed, variable, 



136. 

 degrees of utility of, 181. 



