334 Extract from the third Vbhnne of 



99 



Dr. Kennedy makes no mention of magnesia, but he in- 

 dicates muriatic acid as one of the principles of basaltes. 

 M. Klaproth analysed it again, in order to try to discover 

 it. He decomposed basaltes by nitric acid, and poured into 

 the solution a solution of nitrate of silver. He observed a 

 slight cloud, and collected a deposit which weighed 3-lOths 

 of a grain. On this muriate of silver he found nitric acid, 

 which reduced it to l-20th of a grain ; a quantity so small, 

 that it does not announce the hundredth part of a grain of 

 muriatic acid in the basaltes of Hasenberg. 



Analysis of the Gold Ore of Transyli'-ania. 



It was by the analysis of these gold ores, so rich, that 

 M. Klaproth discovered tellurium ; and as this new metal 

 constitutes the greater part of them, they hav^e since been 

 called the auriferous ores of Tellurium. Under this name 

 M. Klaproth con)prehends, 



1st, That of paradoxal gold, or the problematic metal 

 taken from Mariahilf, near Zalathna, in the mountains of 

 Faczebayer in Transylvania. 



A thousand parts of this ore of tellurium are composed of 

 Tellurium - - 925.50 



Iron _ _ _ 72-00 



Gold - - - 2-50 



1000 



2d, The ore of graphic gold of Offcnbanya, which is very 

 rich. It contains 



Tellurium •■ - - 60 



Gold ~ - - 30 . 



Silver - - - 10 



100 



3d, That 



