Ok pa ' 
' 
308 Dr. Wituerine’s Experiments and Obfervations <M 
little or nothing of its weight by being made red-hot, Specific 
gravity 4,330. 
ESOP BRR NOT Re 
_ A. Ground in a mortar, and wafhed over, the wafhing wa= 
ter, when decanted, gave no precipitation with mild vegetable 
aikaly; but with nitre of. filver and nitre ef mercury the 
lighter cloud imaginable. ; 
B. 100 grains boiled in marine acid Sea A after proper 
wafhing st drying, 99,5. 
C. The acid folution B let fall a Pruffian blue upon the ad= 
dition of a fingle drop of phlogifticated fixed alkaly; and, 
when faturated with mild foffil alkaly, afforded an ochre 
loured precipitate. 
D. This precipitate, colle€ted and’ wafhed, weighed half a 
grain. It was roafted with tallow, and then was wholly, ate 
ea by a magnet. q 
EK. A quantity of the cauk, finely powdered, was rio 
with charcoal-duft, and roafted in a crucible at a white heat, 
for five hours, frefh charcoal-duft being occafionally added. Ie 
gave out a {trong {mell of fulphur. 
F, To this roafted cauk nitrous acid was-added, which dif= 
folved the greater part of it; producing, during the folution;. 
fome effervefcence, anda ftrong fmell of hepar fulphuris. 
G. Some of this folution, after proper evaporation, afforded 
beautiful cryftals, not deliquefcent, exaétly refembling thofe 
obtained from the marmor metallicum, (§ II. H.). 
H.\To other portions of the folution F, were added fixed! 
vegetableand:foflilialkalics, and likewife volatile-alkaly,, each: 
of -which:precipitated:the.carth:from.the acid, 


1. This 
