MINERALOGY. 
fiad not been prefent ? This compound, or black 
lead, and many more, in which the iron and tin 
are united, are not eafily to be examined by the 
common docimaftical means: However, eafier 
procelTes may poffibly, fome time or other, be 
•difcovered, and employed for fuch fubftances. 
SECT. CLXXXIV. 
5. Lead, Plumbum^ Saturnus, It is 
Of a blueifli white colour when frefh 
broke, but foon dulls or fullies in the air. 
h. Is very heavy; viz. to water as 11,325 
to 1000. 
r. Is fofteft next to gold, but has no great 
tenacity, and is not in the leall fonorous. 
d. It is eafily calciaed ; and, by a certain art 
in managing the degrees of the fire, its 
calx becomes white, yellow, and red. 
A This calx melts eafier than any other me- 
tallic calx to a glafs, which becomes of a 
yellow colour, and femi-tranfparent. This 
glafs brings other bodies, and the imper- 
fect metals, into fufion with it. 
/. It clifTolves, I ft, in the fpirit of nitre ; 
zdly, in a diluted oil of vitriol, by way of 
digeftion ; 3dly, in the vegetable acid ; 
4thly, in alcaline folutions ; and 5thly, in 
expreffed 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 
effeft as iiiver, whereby is produced a 
faturniis cornens. 
k. It does not unite with iron, when it is 
alone added to it in the fire. 
N 4. /. It 
