A SYSTEM OF 
P4 
l. It works on the cuppel, which fignifies that 
its glafs enters into certain porous bodies, 
deftitute of phlogifton, and alcaline falts. 
m. It melts in the fire before it is made red- 
hot, almoft as eafily as the tin. 
n. Its calx or glafs may be reduced to its me^ 
taliic ftate by pot-afhes. 
SECT. CTXXXy, 
Lead is found. 
In form of a calx, Miner a plumhi calciformUl 
1. Pure, Miner a plumhi calcif or mis pur a, 
a. Friable, lead ochre, Cerujfa nativay 
Native cerufs, is found at Kriftierfberget 
in Weftmanland, on the furface of the 
potter’s ore. 
Indurated, Lead fpar, or fpatofe lead 
ore, Spatum plumhi. 
V. Radiated, or fibrous. 
a. White, from Mendip-Hills, ia 
England. 
2. Criftallifed into a prifmatical figure. 
d. White, from Norrgrufya in Weft- 
manland. 
h. Yellowifb green, from Zchopau in 
Saxony. 
SECT. CLXXXVL 
2. Mixed, Miner a plumhi c aid for mis mi-xta. 
d. With the calx of arfenie, Arfenic lead- 
fpar. 
I. Indurated. 
a. White. I have tried fuch an ore 
from an unknown place in Ger- 
many, and found that no metallic 
lead 
