INDEX. 429 



Potassa, analysis of the feiTO-prussiate of, 209-211 — and of the 



subsulphate of, 389 

 Prize questions by the Society of Sciences and Arts of Utrecht, 



385, 410— by the Royal Academy of Science at Paris, 409 — 



by the Societe Medicale d'Emulation, 410 — by the Helvetic 



Society of Natural Sciences, ibid. 

 Prussiates, experiments and observations on the composition 



of, 208-216 

 Publications (scientific), select list of, 225, 412 — analysis of, 



1 19, 337 — notices of new ones in the press, 412 

 Pyrometer, description and uses of a new one, 309-320 



R 



Refraction (double) of minerals, apparatus for shevs^ing, 199 — 

 observations on atmospherical refraction, 353-370 



Retinasphaltum discovered in the independent coal-formation, 

 221 



Re2/ (John), biographical notice of, 74, 75 — essays of, on the 

 calcination of metals, 76-83, 260-271 



Rochester, account of a mammoth found near, 20-26 



Rocks, on the geological structure of, 216-218 



Ross (Mr.), new porcelain glaze invented by, 392, 393 



Royal Society of London, proceedings of, 118 



s 



Scarlet fever, preservative against, 407 



Secreting power of animals, observations on, 40-44 



Selenium, notice of, 386 



Senna, the active principle of, discovered, 398 



Sepulchre (druidical), notice of, 412 



Siberia, chemical analyses of various copper ores from, 276-278 



Silver ore (red), of Peru, chemical analysis of, 273 



Spring, remarkable eruption of, 406 



South (James, Esq.), corrections in right ascension of thirty-sir 



principal fixed stars to every day of the year, 186-198 

 Subsulphate of alumina and potassa, analyses of 389 

 Sugar, on the crystallization of, 379 

 Sulphur, on the compounds of, 388, 389 

 Sulphuric acid, experiments on, 386, 387 

 Sun, account of the eclipse of, in September 1820, 26-39, 291 



305 

 Sylvester (Mr. Charles), observations of, on the best mode of 



warming and ventilating houses and other buildings, 229-240 



Vol. XI 2 G 



