62a Mr, woulfe’s Experiments to afcertain 
following, which were fubmitted to the fame trials as in 
the firft experiment. 
White fpathofe iron ore from Bayreuth. 
Cornifh and Bohemian tin grains. 
Mendip calamine. 
Semi-pellucid calamine, from Wales. 
Sooty kobalt, from Saxony. 
Somerfetfhire manganefe ; this is the only fort I ever 
faw which is mixed with calcareous fpar, and, on that 
account, effervefces with acids without help of heat. 
CeruJJa nativa , in lump, from Lorraine ; I found this 
to confift of a calx of lead, mixed with an argillaceous 
earth. 
White, tranfparent, lump lead ore, from Somerfet- 
ihire. 
Cat’s-tooth white lead ore, from Ireland. 
White lead ore, from Poulafent in Low Brittany. 
Black, whitifh lead ore, from Tfchoppan in Saxony.. 
Green lead ore, from ditto. 
Green lead ore, from Freibourg in Brifcau.. 
In all tliefe experiments the lead was converted to^ 
mafficot; but, in the two laft, the mafficot had a pale 
greenifh caff, owing to iron, and not to copper: for if 
thefe green lead ores, after having been calcined with 
fixed alkaly and edulcorated, be digefted with acid of 
vitriol, we obtain a greenifh folution; this being then 
deprived of its excefs of acid by an alkaly, filtered and 
mixed with infufion of galls, gives a black, inky colour. 
Having 
