INDEX. 



379 



Nilrcle of stiver. Experiments 

 on, 158 



Nitrous elher by nitrate of mer- 

 cury, 170, 305 



Oak-bark, chemically examined, 

 ^9 ; substitutes for, 140 



CEconomical Societies, 92, 186, 

 283,371 



Opium. A kind of tallow in tlie 

 fccula of, 30 



Optics. Improvements in, 327 



Oranges covered naturally with 

 wax, 30 



Ornithology, 3 59 



Oxide, ivliife. Of iron, 325 



Palladium. On, 288 



Peak of Teneriffe. On tbe, 3 1 ; 



height of, 37; Tilesius on, 



286 



Pearl- stove. Analized, 243 



Peat earth. Analized, 3J0 



Pepyson gems, 193 ; analysis of 



human teetli, 313 



Periscopic spectacles described, 



■327 

 Phosphate rf sO(^. Improved 

 method of preparing, ,9^' 

 Phosphoric aciJ. On, 157 



Piston-safety. Edelcrantz's, 162 

 Pitch stone. Analized, 236 

 Plague. On the, 2^8 



Plants. On fecula of, 22 



Platina applied to porcelain, 135 

 Pneumatic medicine. On, 171, 

 234, 360 

 Poll thing stuff ^or steel, 32 J 

 Porcelain. To coat with platina. 



Portable blast-furnace. Aikin's, 

 i6<5 

 Potash in buck wheat, 9 j 



Printing, calico. On, 323 



Prize questions, 93, 166, 285, 



373 



/V<i/// on fecul.1, 22 



Prussian blue. Curious produc 



tion oi, 326 



,Prussic acid. To obtain pure, 9^ 



Publications. New, 76, 18 8,' 

 230, 284, 307, 364. 

 Pumice stone. Analized, 237 

 Putrefaction. On, 22 



Pain. On the production of, '8 

 Ramsay on curing the bite of a 



snake, ,12 J 



Red oxide of mercury. New way 



to prepare, 139 



Royal Academy of Madrid^ .92 

 Royal Institution, 285 



Ruby. On the, 200 



S.aint Peter shurgh Economical So- 

 ciety , ^ ,95 

 Saffron. Experiments on, 30 

 Salts, sundry aative. Analyzed, 

 76 

 Sapphire. On the, 20 c" 

 Schercr on benzoic acid, i^^ 

 Schulze's black oxfdeof mercury, 

 225 

 Seneca, on mirrors, 2<^v 

 Sharks. On, 317 

 SJio-zver of stones, zjx 

 Silk. On strength of, 34 L 

 5/7/', raw, is covered with wax, 



3» 



Silver, nitrate of. Experiments 



on, 1X58 



Skins. On tanning, 60, 63, 140, 



• 29.5 

 5/idf/"^ ^i/^ cured by volatile al- 

 kali, 12^, 12S 

 Society of National Economy 

 Haarlem, 93 

 Solar eclipse, 92 

 Southern's experiments on fric- 

 tion, • 120 

 Spectacle-glasses. Improvement 

 in form of, 327 

 Speculum, antient. Anal) zed, 269 

 Spirits. On specific gravities of, 

 204,329 

 Stealing, a virtue in some com- 

 munities, I5» '° 

 Steam-engines. Woolf's boiler 

 for, 40 

 Steam-valve. Woolf's, 164 

 Stsndliing, Hints rcfpc.cUJJg, 96' 

 Stonti, 



