410 
INDEX. 
Pendulum-clocks, history of their invention^ 1 97. 
Phillips, Mr, his method of propelling vessels, 302. 
Picropharmacdite, analysis of, 394. 
Pictet, Professor, on a singular effect of lightning, 379. — on an extra- 
ordinary fall of the barometer, 383. 
Pier of suspension at Trinity near Edinburgh described, 23. 
Plants, account of some new and rare ones from Canada, 319- , 
Platinum, on the oxides of, 9* 
on the combination of the earths with, by Mr J. Murray, 385. 
Playfair, Professor, on the slide of Alpnach, 338. 
Phimbago, on the conversion of cast-iron into, 387. 
Polyhalite, analysis of, 393. 
Potassium, improvement in the mode of procuring it, by the Rev. W. 
Mandell, 375. 
Press, account of a new copying one, by Mr Brunei, 293. 
Proceedings of the Royal Society of Edinburgh, 170, 330. — of the 
Wernerian Natural History Society, 172, 373. 
Processes in the arts, 290. 
Pumpkin, on the ancient history of the, 265. 
Pumps, account of an improvement on, 294. 
Pyrometer, improvement on Wedgewood’s, 196. 
Pyroxenes, analysis of the, 14. 
Q 
Quartz, piagiedral, Mr Herschel’s experiments on, 379. 
R 
Radish, on the ancient history of the, 26 1. 
Rajflesia Titan described, 398. 
Rain, storm of, at Catskill, 322. 
Reedhcad, Mr, his method of propelling vessels, 302. 
Rees, Van M. on electro-magnetism, 83, 220. 
Religious paroxysms of the Shetlanders, 250, 
Rhododendron, remarks on, 47. 
Robertson, Rev. Dr A. on Harriott’s MSS. and Bradley’s observations, 
313. — abstract of his meteorological observations at Oxford, 359. 
Robison, Mr, on the difference of level between the East and West 
Seas, 69. 
Rose, Mr Henry, his researches respecting the pyroxenes, 14. — on the 
analysis of analcime, ib. — on the analysis of the oxides of titanum, 15. 
Royal Society of Edinburgh, account of its proceedings, I70, 370. 
Rubies, effects of heat on the colour of, 379* 
Rutherford, Mr W. on the Tritoma media, I90. 
S 
Safety-lamp, description of a new one for mines, 292. 
Sapphirine, 391. 
Sassafras, oriental, described, 398. 
Saul, Mr, his new fruit-gatherer, 297- 
Scoresby, Mr William, on the impregnation of wood by sea-water, 
115. — on the fogs of the polar seas, 118. 
