Nitric and nitrous acid. Tu teft, 



82 



Nitrous oxide. Experiments with, 



86 



Nouel on multiplying fifh, 1^9 



Nutmegs. Culture of, 359 



Ocean water. Caufe. of luminous 

 appearance of, 20 



Oil. To purify Rapefeed, 68 

 Oil from the dogberry tree, 318 

 Oil paint. Subflitute for, 338 

 Old people put to death, 240 

 Optics. Improvements in, 180 

 Otomaqua Indians eat earth, 4 

 Oxymuriates. Bleaching witli^ 



249, 301 

 Oxy muriatic acid. On, 248, 257, 



286, 301 



Oxygen gas. A prize queflion on > 



284 



Paarlberg mountain in South 

 Africa defcribed, 222 



Panning in oil. Subllitutefor, 338 

 Paper materials. To bleach, 3 1 3 

 Pepyss galvanometer, . 3 9 



Pitlet, ProfeJJbr, on flexible 

 itones, 277 



Pkyjics. Prize queftions in, 177 

 Planet. Difcovery of a New, 



285,-367 

 Poifon of the Indians on the Rid 

 . Nigro, how made : not nox- . 

 ious taken internally : deoxi- 

 dates the blood: decomposes 

 atmofphtric air, 6 



Potafh, ufe of, in bleaching, 249 : 

 on obtaining, 330 



Plttcry. A new glazing for, 260 

 Pre.ipi/afion of metals, 1 29 



Prints. To whiten, 299 



Printing. On the origin of Stereo- 

 type, 267. Specimens of, 272 

 Prize quejlions, 92, 1^7, 185, 

 284,3-6 

 Prouft on citric acid, 112 



Publications. New, 80, 282 



NDE X; 



Pyrometry, 



379" 



Pump. Buchanan 5 



improved, 

 *9$ 



Rap£fee.doil. To purify, 68 



Refraclion, t>ouble, applied to 



meai'ure angles, 180 



R.iv.eche on detecting lead in 



wine, 545 



Re f ulting affinity, what, 133 



Richard/on. Profefibr, 3 50 



Rittcnhoufe on expanfion of tfood 



by heat* 34$ 



Rob if on, ProfeJJbr, Life of, 34 S 

 Romdn jWords. Materials of* 



Rome. Longitude of, 367 



Rooms propofed to be warmed by 

 {learn, 46 



Royal Daniflj Academy, « 284 

 Royal Injlitution of Great Britain^ 

 81,86 

 Royal Society of Gottingeri, 284 

 Royal Society of London, 8d, 85 

 Rumford, Count, on increaiing 

 the heat from fuel, 42. Ori 

 iteam as a vehicle for convey- 

 ing heat, 46. Biennial pre- 

 mium inftituted by, 95 



Salt mines in Poland, 289 



Sauffure, T. on aluminey 28, 152 

 Savage flute. Man in the,- -189 

 Scalping of captives, 239 



Sea. On luminous appearance of 



the, 20 



Sheathing fbips <voith metal, prac- 



tifed by the anticnts, 340 

 Ship's pump. Buchanan's, 195 

 Silk-. On bleaching, 163. Baking 



of, what, 104 



Silver found in Herland mine, 



77*374 

 Sine I air, Sir J. on cottagers keep- 

 ing cows, 227 

 Snart on Gnats, 3,4 

 Soap, ufe of, in bleaching, 252 

 Soap making. Hi n ts o n , 334 

 Society of Arts, &e. Adelphi, 87 

 So J. 1, ufe of, in bleaching, 252 

 Span'jh wool. On, 287 



I CI 



Spongy a!ur. r t::u' } what, 



Steafft 



