"Lead. 297 



crucible lined with charcoal, and to which a 

 cover is luted 5 fufion fhould be fpeedily 

 procured. 



17. Mr. Bergman recommends a mixture 

 of one part of the ore with two of tartar, i 

 of black flux, and i part of rofm : this is 

 to be divided into three parts, and each fuc- 

 ceffively projeded into a crucible heated 

 white, and immediately covered after the 

 foregoing portion ceafes to flame ; the whole 

 operation takes up but 7 minutes or lefe. 

 Stc/. . 304. 



CHAP. VII. 



Lead. 



1. This metal is fufficiently diftinguifhable 

 by its colour, which is well known, its fpecific 

 gravity, which reaches from 11,3 to 11,479, 

 its great foftnefs and eafy fufibility. It is 

 more or lefs foluble in all acids, and particu- 

 larly in the nitrous, and all its folutions have 

 a fweetifh tafte, it is precipitable from the 

 nitrous by the vitriolic or marine, and from 

 the marine alfo, by the vitriolic. 



SPECIES I. 



Native Lead. 



2. It is faid to have been found in Mon- 



mouth/hire 



