MINERALOGY. i$ 3 



had not been prefent ? This compound, or black 

 lead, and many more, in which the iron and tin 

 are united, are not eaiily to be examined by the 

 common docimaftical means : However, eafier 

 proceffes may pofiibly, fome time or other, be 

 difcovered, and employed for fuch fubftances. 



SECT. CLXXXIV. 



5. Lead, Plumbum, Saturnus. It is 

 a. Of a blueifii white colour when frefli 

 broke, but foon dulls or luilies in the air. 

 h Is very heavy; viz. to water as 11,325 

 to 1000. 



c. Is fofteft next to gold, but has no great 

 tenacity, and is not in the lead fonorous. 



d. It is eafily calcined ; and, by a certain art 

 in managing the degrees of the fire, its 

 calx becomes white, yellow, and red. 



c. This calx melts eafier than any other me- 

 tallic calx to a giafs, which becomes of a 

 yellow colour, and femi-tranfparent. This 

 glafs brings other bodies, and the imper- 

 fect metals, into fufion with it. 



/. It diflblves, ift, in the fpirit of nitre; 

 2dly, in a diluted oil of vitriol, by way of 

 digeftion ; jdly, in the vegetable acid ; 

 4thly, in alcaline folutions ; and 5 thly, in 

 exprefied oils, both in the form of metal 

 and of calx. 



g It gives a fweet tafte to all folutions. 



h. It amalgamates with quickfilver. 



i. With the fpirit of fea-falt it has the fame 

 effect as iilver, whereby is produced a 

 fat ur mis comeus. 



k. It does not unite with iron, when it is 

 alone added to it in the fire. 



N 4 I It 



