WITH THE MARINE ACID. 343 



ofcorrofive mercury is boiled in an iron vcflcl, 

 the vcffel will be affccfled with its acrimony, and 

 quickfilver will be collected at the bottom of it. 

 If copper or brafs is immcrfccl in the folution, 

 they are covered with a (liming pellicle of quick- 

 filver. 7.inc alfo detaches mercury from the 

 muriatic acid, and forms with it an amalgam*. 

 From the combination of various metals with 

 corrofivc mercury, and fubfcqucnt did illation, 

 arife the butters commonly to called, or thick 

 fluids, the greater! part of which is more or lc(s 

 impregnated with metallic matter. Of this kind 

 arc the butters produced by the diflillation of 

 the ores of lead, tin, bifmuth, 7,incf,or rcgulus of 

 antimony, with corrofive fublimate. Silver, 

 lead J, and copper, cflcd a fcparation of the mer- 

 cury from the muriatic acid. The red powder, 

 occafioncd by expofmg equal quantities ofcor- 

 rofive mercury and iron to the fire, infpiflating, 

 and afterwards fubliming them, as fccn by Car- 

 diluccins, has been fmce dcmonflrated from the 

 repeated experiments of Pott; who however 

 adds, that he was lefs fucccfsful in his attempt 

 to afcertain what had been bcfides remarked by 

 Cardiluccius in this procefs, that the rcfiduum 

 being expofcd to the air, and again fublimcd, 

 yielded a talcy fubflancc ; and that from what 



Y4 ftiU 



* Pott dc zinco, in Obff. Coll. II. 



f Pott dc fair, &c. 



J Brand in A& Acad. Bucc. 1753. 



