2 9 2 Lhe Vegetation of Metals . 
When any Metal is diffolved in a Men- 
ftruum, Multitudes of its feparated and very 
minute Particles are fufpended in the Men- 
itruum, as are likewife the Particles of its 
Salt or Vitriol. In this Mixture, when fet 
to red:, many of the fait or vitriolic Par¬ 
ticles are brought together, after a while, 
by Precipitation and Attraction, carrying 
with them Particles of the Metal and form 
Cryftals, in Figures peculiar to the Metal 
diffolved : viz. Lead produces Cubes, Lin 
quadrilateral Pyramids ; Copper produces ob¬ 
lique-angled Parallelipipids, and Iron rhom- 
boidal Cryftals. This is the Cafe of one 
Metal diffolved fingly in a Mendruum with¬ 
out any Mixture ; and no farther Altera¬ 
tion happens by keeping, than that more 
Cryftals will form like the frit, or that the 
firft become enlarged, by the Precipitation 
and Attraction of more of the vitriolic Salt: 
Perhaps too fome of the metallic Particles (if 
it has been over-charged) will be found at 
the Bottom of the Fluid, though great Part 
of them will always remain fufpended. 
But if different Metals or metallic Sub- 
Itances be diffolved in the fame Mendruum, 
or in different Mendrua, and afterwards 
mixed together: or if other Fluids be 
poured into any Solution of a Metal or Mir 
neral, the fufpended metallic and vitriolic 
Particles, having different Degrees of At¬ 
traction and Gravity, are precipitated and 
attracted 
