New Publications^ 8 1 



II. Journals of the Royal Injlitution of Great Britain. 

 Numbers 2 and 3. 



Each fheet of thefe journals 13 counted as one Number, 

 priee fixpence. The contents of No. 2 and 3 are: — 1. A 

 .Report on the Progrefs which has been made in the Arrange- 

 ment of the Royal Inftitiuion, its prefent State, and its pro- 

 bable future Profperity and Utility. — 2. Obiervations relative 

 to the Means of increafing the Quantities of Heat obtained 

 in the Combuftion of Fuel. By Count Rumford. — -3. On 

 the Ufe of Steam as a Vehicle for conveying Heat from one 

 Place to another. By Count Rumford. — 4. An Account of a 

 new Eudiometer. By Mr. Davy. 



The three laft-mentioned articles will be found copied into 

 the preceding pages of our prefent Number* 



III. An Epitome of Chemijhy. By William Henry. Smalt 

 3 27//0. Johnfon, St. Paul's Church-Yard.' 



[Concluded from Vol. IX. p. 268.] 



Though we have already laid before our readers a pretty- 

 ample extract from this ufeful little volume, we believe they 

 will not be difpleafed by a further one. Among the rules 

 for afcertaining the purity of chemical preparations are the 

 following : 



" Sulphuric Acid — Acidum Vitriolicum of the London Phar- 

 macopoeia.- — Oil of Vitriol. 



<e The fpecific gravity of fulphuric acid mould be 1850. 

 It mould remain perfectly tranfparent, when diluted with 

 diililled water. If a fediment fhould occur, on dilution, it 

 is a proof of the prefence of fulphate of lead or lime. 



" Iron will be detected in fulphuric acid by faturating a 

 diluted portion of it with pure carbonate of foda, and adding 

 pruffiate of potalh, which will manifeft the prefence of iron 

 t>y a pruiTIan blue precipitate. Copper may be difcovered 

 by pouring, into a limilar faturated folution, pure folution 

 of ammonia; and lead may be detected by the fulphuret of 

 ammonia. The latter metal, however, is generally precipi- 

 tated, on dilution, in combination with fulphuric acid. 



" Sulphate of potath or of foda may be found by faturating 

 the diluted acid with ammonia, evaporating to drynefs, and 

 applying a pretty (trong heat. The fulphate of ammonia will 

 elcape, and that of potaih or of foda will remain, and may 

 be diftinguiflied bv its folubility and other characters. 



Vol. X. F " Nitrk 



