INDEX. 409 



N. 



Natural History, miscellaneous intelligence concernino- 173-187 



349-362. 

 Nickel, process for obtaining pure, 161, 162. 

 Nitric ether, on tiie preparation of, 369, 370. 

 Nutation of Stars, investigation of the correction of, 21-27. 



o. 



Oak Bark, substitute for, 165,166. 



Oat Seeds, antient, growth of, 348. 



Oil, on the preparation of Gas from, 120-124. 



Oil-j)ainting, purple colour for, 380, 381. 



Onions, beneficial effects of transplanting, 342, 343. 



Opium (British) apparatus for the manufacture of, 236, 237. — 



Instructions for collecting and making it, 238-240. 

 Orchiclece, select from the Cape of Good Hope, description of, 



220,221. 

 Oxidation of copper and silver, 168-170. 

 Oxides of mercury, composition of, 379. — Volatility of the oxide 



of lead, ibid. 

 Oxygenated water, observations on the preparation of, 114-120, 



154, 155. 



P. 



Panapana (Village^ notice of, 261. 



Paris, number of suicides in, 189. 



Parkes (Mr. S.) Description of the processes used in the manu- 

 facture of tin-plate, 141-151. 



Persia, mode of purifying silver in, 160. — Steel, how prepared 

 there, ibid., 161. 



Peruvian Bark, extraordinary effects of, 182,183. 



Philip (Dr. Wilson) on the agency of galvanism, 72-87. 



Phosphoric Acid, discovered in vegetables, 382. 



PilgritnagetoMecca., account of, 45,46. — Ceremonies performed 

 there, by the pilgrims, 55-58. 



Plagne {M.) analysis of sea-water by, 167. 



Plague, how introducecl into Africa, 183. — Observations on the 

 treatment of, 184. 



Play/air (the late Professor) estimate of the character and me- 

 rits of, 124-136. 



Pneumatic Apparatus, new stop-cock for, described, 347, 348. 



Pompeii, successful excavations at, 189,190. 



Poppies, on the manufacture of British opium from, 234-240. 



Potassium and sodium, analysis of mixtures of the chlorides of, 

 367, 368. 



Prevost (M.) notice of the death of, 195, 196. 



Prize Questions, in chemistry, 168. — In meteorology, 177. — By 

 the Royal College of Surgeons, 186, 187.— In literature, by 



