532 



INDEX. 



Newton, Sir I., attacked for irre- 



ligion, 496. 

 , Prof. , on eartli attached to 



a partridge's foot, 387. 

 Nicotiana, crossed varieties of, 



305. 

 , certain species very sterile, 



286. 

 Nitsche, Dr., on tlie Polyzoa, 



338. 

 Noble, Mr. , on fertility of Rhodo- 

 dendron, 283. 

 Nodules, phosphatic, in azoic 



rocks, 339. 



Oaks, variability of, 47. 



Onites, appelles, 139. 



Ononis, small imperfect flowers 

 of, 304. 



Orchids, fertilization of, 183. 



, the development of their 



flowers, 330. 



, forms of, 438. 



Orchis, pollen of, 180. 



Organization, tendency to ad- 

 vance, 116. 



Organs of extreme perfection, 170, 



, electric, of fishes, 178. 



, of little^importance, 186. 



, homologous, 451. 



-'""- , rndiments of, and nascent, 

 467. 



Ornithofhynchus, 98, 482. 



, mammae of, 224. 



Ostrich not capable of flight, 313. 



, habit of laying eggs to- 

 gether, 355. 



, American, two species of, 



375. 



Otter, habits of, how acquired, 

 164. 



Ouzel, water, 169. 



Owen, Prof., on birds not flying, 

 128. 



- , on vegetative repetition, 

 141. 



, on variability of unusually 



developed parts, 141. 



, on the eyes of fishes, 178. 



— '-, <m the swim-bladder of 

 fishes, 176. 



Owen, Prof., on fossil horse of La 

 Plata, 348. 



, on generalized form, 357. 



, on relation of ruminants 



and pachyderms, 357. 



, on fossil birds of New Zea- 

 land, 367. 



, on succession of types, 367. 



, on affinities of the dugong, 



431. 



, on homologous organs, 451. 



, on the metamorphosis of ce- 



phalopods, 459. 



Pacific Ocean, faunas of, 375. 



Pacini, on electic organs, 179. 



Paley, on no organ formed to give 

 pain, 193. 



Pallas, on the fertility of the 

 domesticated descendants of 

 wild stocks, 384. 



Palm with hooks, 188. 



Papaper bracteatum, 206. 



Paraguay, cattle destroyed by 

 flies, 67. 



Parasites, 353. 



Partridge, with ball of earth at- 

 tached to foot, 387. 



Parts greatly developed, variable, 

 141. 



Parus major, 168. 



Passiflora, 281. 



Peaches in United States, 78. 



Pear, grafts of, 290. 



Pedicellarite, 226. 



Pelagornium, flowers of, 188. 



, sterility of, 282. 



Pelvis of women, 137. 



Peloria, 138. 



Period, glacial, 889. 



Petrels, habits of, 169. 



Phasianus, fertility of hybrids, 

 283. 



Pheasant, young, wild, 249. 



Pictet, Prof., on groups of spe- 

 cies suddenly appearing, 333. 



, on rate of organic change, 



, on continuous succession of 



genera, 846. 



