486 



Index. 



Nest and eggs of cicada occidentals, 



432. 

 Neutral equilibrium, 345. 

 Newton stone, 475. 

 Nimbus, or rain cloud, 110. 

 Nitride of iron, 311, 399. 

 Nitro-glycerine, 153. 

 Normal form of snail leech, 82. 

 Notes and memoranda, 78, 158, 238, 



319, 399, 478. 



Occxtltations, notes on, 207, 216, 292, 

 375, 460. 



Ocean bed, affecting submarine tele- 

 graph, 116. 



Oceanic tides, 62. 



Opaque illuminators for high powers, 

 467. 



Ophiuchi, 140. 



Opposition of Ceres, 454. 



Optical adjustment of the eye, 79. 



Orchids, golden netted-leaved, 401. 



Orford, Norman Castle, 40. 



Organic remains at Royston, 38. 



Origin of Staffordshire iron ores, 471. 



Oscillation of the barometer, 251. 



Ostracoda, a section of Crustacea, 324. 



Oxidation of fat oils by the action of 

 the atmosphere, 229. 



Oxygen, economic source of, 64. 



Ozone, 472. 



Padina pavonia, 259. 



Psecilopods, a genus of Crustacea, 323. 



Palimpsests, 63. 



Palus Somnii, 28. 



Paper, introduction to western world, 



151. 

 Parallel roads of Glen Eoy, 396. 

 Parasites, vegetable, of the human skin, 



397. 

 Peewit Island, 36. 

 Permian and Triassic systems, 438. 

 Peruvian astronomy, 7. 

 Pharaoh's serpents, 319. 

 Phenomena of cell rotation, 113. 

 Philocalia, 391. 

 Photography at Greenwich Observatory, 



12, 19. 

 Photography in the dark, 156. 

 Photo-printing, 308. 

 Phyllopoda, a genus of Crustacea, 323. 

 Pig-iron converted into malleable steel, 



316. 

 Pigments, spectra of, 348. 

 Plants and shrubs of the Pyrenees, 440. 

 Pleasant ways in science, 266, 342, 461. 

 Plinius, a lunar crater, 29. 

 Plumage of the crossbills, 190. 

 Poisoning by precious stones, 217. 

 Polar expedition, Airey on, 79. 



Polar sea temperature, 478. 



Portable submarine light, 67. 



Portraits of authors, philosophers, 177. 



Portraits, British, before and during 

 the Tudor period, 95. 



Portraits illustrative of the French Re- 

 volution and First Empire, 174. 



Portraits, miscellaneous, contemporary, 

 or quasi-contemporary, 179. 



Portraits of painters, 178. 



Position micrometer, substitute for, 

 447. 



Potting orchids, 404. 



Pottery and stone weapons, 355. 



Precious stones, 216. 



Precious stones, to make by artificial 

 means, 218. 



Presents sent by Montezuma to Cortez, 

 6. 



Proceedings of Learned Societies, 76, 

 157, 236, 316, 395, 476. 



Proclus, 28. 



Producing light for photographic pur- 

 poses, 471. 



Progress of invention, 63, 152, 227, 

 308, 381, 469. 



Ptilota plumosa, 259. 



Pyrenees, hot springs and natural fea- 

 features, 439. 



Pyrogallic acid, economic production 

 of, 382. 



Radiation, 59. 



Rain at the equator, 246. 



Red crag, the, 34. 



Relative humidity of the air, 104. 



Removing hair from hides, 228. 



Reproducing drawings, 156. 



Researches in Durham, 315. 



Results of meteorological observations 



made at the Eew Observatory, 42, 



278. 

 Revolving mirror for measuring the 



motion of light, 271. 

 Rigid spectroscope, 69. 

 Ring system of Saturn, 54. 

 River marks, 11. 



Roman coins in Isle of Wight, 387. 

 Roman remains at Filey, 234. 

 Roman pottery, 161. 

 Roman villas in Chedworth Wood, 



and Cirencester, 150. 

 Roman votive altar in Gainford church, 



234. 

 Roofs on the principle of suspension 



bridges, 156, 275. 

 Rotation of cyclones, 337. 

 Royal Charter storm, 340. 



Sagaetia bellis, 263. 

 Sagartia dianthus, 263. 



