s8o Nhuf Publication. 



of them to fav, that they are from the graver of Lownr, 

 and equal in merit and execution to thofe given in the Phi- 

 lofophical Magazine. 



The tranflator, who has not givetl his name, has performed 

 his tafk in a manner creditable to himfelf. He has fhown 

 himfelf fome thing more than a mere literary drudge : he has 

 corrected feveral overlights of the author, or rather, perhaps, 

 inaccuracies of the French printer, which, though often only 

 a (ingle letter in the name of a compound body, were of im- 

 portance. The terminations in ates, and itc.s, and ats, fo 

 ufeful in the modern nomenclature, have this inconvenience — 

 they are fo nearly (imilar, that printers, not chemifls, will 

 often fubftitute the one for the other. We fpeak this from 

 experience, and we may be allowed to take this opportunity 

 of recommending to chemical authors always to revife after 

 the printer before their {heets are put to prefs. 



A fhort appendix has been added by the tranflator, con- 

 taining fome ufeful notes and notices of new facts difcovered 

 fince the original work was published \ and alfo feveral tables 

 of French weights, Sec. 



We (hall here give a few extracts, which, at the fame time 

 that they ferve as a fpecimen of the work and of the tranfla- 

 tion, will furnifh information or amufement to fome of our 

 readers. 



Fluoric Acid. 



For our knowledge of the fluoric acid we are indebted to 

 Scheele. 



This appellation was given to it becaufe it is extracted 

 from a kind of earthy neutral fait, known under the name of 

 /parry Jiuor, pbofpboric mineral, Jluate of lime. 



As the fluoric acid diflolves glafs, it is neceflary, when 

 you with to have it pure, to employ for that operation veflels 

 of a metal on which neither it nor the fulphuric acid excr- 

 cifes any action : lead, among the known metals, is that 

 which is beft fitted for this purpofe. 



There are two methods of preparing this acid : ift, With 

 & metallic apparatus : 2d, With a glafs apparatus. 



ift, To obtain the fluoric acid alone, and free from every 

 combination, put one part of the fluate of lirne, reduced to 



powder, 



