SCIENTIFIC NEWS. 303 



Dutch proof, from five pounds of the dried fruit. This brandy, 

 although it retains a flight odour of the fruit, is by no means 

 difagreeableto the tafte, and I have made liqueurs with it in no 

 refpect inferior to thofe of commerce. I fhall not delay the 

 pubhcation of the details of this difcovery, from which I claim 

 no credit except on account of the influence which it may have 

 on a part of the commerce of the eaftern provinces of Spain, 



Method of obtaining pure Cobalt. By Tr o m s d o r f f *• 



LET four parts of finely pulverized zafl^re be inlimately PurccoWti 

 blended with one of very dry nitrate of potafli and half a part 

 of charcoal powder; introduce this mixture by fma!) quantities 

 at a time into an ignited crucible, and repeat this procefs for 

 three fucceflive times, by again adding to the detonated refi- 

 duary mafs new quantities of nitrate of potafli and charcoal. 

 This being done, mix the mafs with one part of black flux, 

 and expofe the mixture to a red heat for one hour. When 

 cooled, feparate the metallic cobalt, pulverife it, blend it to- 

 gether with three times its own weight of nitrate of potafli, 

 and detonate this mixture as directed before. The iron which 

 was prefent will thus became highly oxidized, and the arfenic 

 acidified, and combined with the potafli. To feparate the 

 latter, pulverife the mafs, treat it repeatedly in water, and fe- 

 parate the infoluble part by the filtre. The arfeniate of potafli 

 being thus got rid of, digefl the refidue in nitric acid ; the 

 cobalt will now be diflfolved, and the highly oxidized iron re- 

 main untouched. Evaporate the folution to drynefs, rediflblve 

 it in nitric acid, re-filtre the folution, in cafe fome oxide of 

 iron fliould have efcaped unfeparated, decora pofe the folution 

 of nitrate of cobalt by potafli, wafli the precipitate, and re- 

 duce it by heat. 



Metliod of coatiitg Copper with Platina, Bj/ Strauss. 



Mr, Straufs, who has made a number of good ej^periraents Coating copper 

 on platina, has fucceeded in applying this metal to defend the^^'^ platma. 

 face of copper. The folution of platina was precipitated by 



» Gehlen's Journal of Chemiftry, Vol. IV, p. 6, 117. 



jnuriate 



