i 30 ] 
ill I. A nez 
v Method of ajaying Copper Ores. 
■By George Fordyee, M. D. F. R. S. 
Read Nov. 25, 1779. 
process. 
T AKE 100 gn * ilu of the ore . powder it finely, put 
“ lnto a fma11 m«rafs or a glafs phial, pour upon 
• half an ounce of nitrous acid, of the ftrength com- 
monly fold by the name of aqua fortis, that is, the pure 
.acid d. fitted wtth about four times its weigh, of water; 
and half an ounce of muriatic acid fold by the name of 
f m ° f &It; P' ace the vefiel in a fand heat, or if you 
have none, an iron pot or fire fiaovel with fand may be 
put over a common fire, and the matrafs or phial fet in 
a • Ratle a moderate heat, an effervefcence will take 
t C Jm* e m ° & P T When this ceal ' es increafe 
heat till it is renewed, and fo proceed till the li quor 
■ 1 ’ 7-fV S aIf ° t0 b£ d ° ne Lf no eff ervefcence take, 
place; bad them together for a quarter of an hour 
Remove the veffel from the fire, and le, it cool,' then 
pour tuto r, two ounces of water, flrake them together! 
5 
and 
