112 ACr.JCULTURAL MUSEUM 



cipally on the surface of the iron, and sometimes in a 

 powder at the bottom of tlic bason. 



Docantthe fluid from the copper and iron, with great 

 care, into another bason, so that as !itt<e as possible, or 

 none of the copper be carried along with it. 



Wash the metals in a p'nt of water ; let tliem subside 

 perfectly, and pour this water into the second bason, 

 %vith the same care. 



Repeat the washini^ thi'ce times? if any copper be 

 found in the second bason, let the Avashitigs stand in it fdv 

 half an hour, so that the metal shall subside ; decant tHe 

 fluid carefully off, and return the copper into the first ba- 

 son. Pour upon tlie copper and iron one ounce of \itn- 

 olic acid, and two ounces of uater ; let them stand to- 

 gether for a quarter of an hour, or until the copper shall 

 be easily separable from the iron. Separate the coppof 

 from the iron, taking great care that none be lost ; the 

 remaining iron may be laid aside. Pour the acid from 

 the copper, after it has subsided, into the second bason ; 

 •wash the copper with a pint of water, and repeat the 

 washing three times, as before directed. 



Great care is to be taken, in decanting both the acid 

 and w^ashings into the secontl bason, that none of the 

 copper goes along with them ; lest any should, they 

 ought to stand for half an hour in the second bason, and 

 be decanted from it also with care ; and, if any copper 

 is found at the bottem, it is to be washed, and added to 

 the rest. 



Tlie copper is now to be dried and weighed, and gives 

 the proportion contained in the ore. 



7b he Continued. 



rniXTED FOR AND PUBLISHED BY DAVID WILEY. 



Price '^ 2.50 for twenhj four Numbers, 

 To he paid in advanr:e. 



