|#4 A SYSTEM OF 



/. 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* 

 tallic ftate by pot-afhes. 



SECT. CLXXXV, 



Lead is found, 

 \4- In form of a calx, Miner a plumb i calciformis, 

 l f Pure, Miner a plumbi calciformis pur a. 

 a. Friable, lead ochre, CeruJJa nativa* 

 ^Native cerufs, is found at Kriftierfberget 

 in Weftmanland, on the furface of the 

 potter's ore. 

 i. Indurated, Lead fpar, or fpatofe lead 

 ore, Spatum plumbi. 

 I. Radiated, or fibrous. 

 a. Whife, from Mendip-Hills, in 

 England. 

 %. Criftallifed into a prifmatical figure. 

 #. White, from Norrgrufva in Weft* 



manland. 

 h. Yellowim green, from Zchopau in 

 Saxony, 



SECT. CLXXXVI. 



2. Mixed, Miner a plumbi calciformis mixta. 

 a. With the calx of arfenic, 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 



