Dr. fordyce's Method \ See. 31 
and let them ftand till the liquor is clear; pour the clear 
liquor into a baion. where, it may be preferved. 
Add to the refiduum a frefli half ounce of each of the 
acids, and proceed again in the fame manner, mixing 
the clear liquor with that procured by the fir ft procefs. 
The fame operation is to be repeated until the frefli 
acids acquire no tinge of blue or green. 
Diffolve half a pound of mild fixed vegetable alkali,, 
commonly fold by the name of fait of tartar, in a quart 
pf water.- Purify the folution either by filtration, or let- 
ting the impurities fubfide, and decanting the liquor 
clear into a glafs veflel. Pour the folution of the alkali i 
llowly into the bafon containing the fluid, procured by 
the former procefles, until the whole matter be precipi- 
tated from the acids. 
Add, by a little at a time, as much vitriolic acid, com- 
monly fold by the name of oil of vitriol, as will re-dif- 
folve the whole, or only leave a white powder; if there 
lhould be any fueh powder, which is feldom the cafe, it 
mult be feparated by filtration. 
Having the liquor in the bafon now clear, put into it 
a piece of iron, bright and free from ruft, and at leaf: an 
ounce in weight, and leave them together for twenty- 
four hours, the copper will be found precipitated, prin- 
cipally on the furface of the iron, and fometimes in a i 
powder at the bottom of the bafon. 
Decant? 
