[ 6.58 ] 
run freely. Soon after, it appeared covered with a 
greyifh matter, which at firfb was apprehended to be 
a precipitate, but was found afterwards to be a part 
of the mercury corroded. Upon applying a moderate 
heat, the whole of the quickfilver, the quantity of 
which was very confiderable, was diffolved, without 
any precipitation. 
The experiment was repeated with a larger quan- 
tity of mercury than the folution was capable of 
taking up. The platina now gradually fell down 
among the undiffolved quickfilver, in form of a dark 
brownifh powder - 3 leaving the liquor nearly colour- 
lefs. 
5. A folution of gold mingled uniformly with a 
folution of platina, without occafioning any turbid- 
nefs or precipitation. The mixture, diluted with 
water, and differed to ffand for fome time, threw up 
a bright golden pellicle to the furface. 
Experiment p. 
1. A folution of platina, fuper- impregnated with 
as much mercury as it was capable of taking up, on 
being evaporated a little, fo as to difpofe it to fhoot, 
yielded cryflals not at all like thofe of platina, but in 
form of fpicula, externally of a yellowifh hue. Thefe, 
flightly wafhed with proof fpirit, became colourlefs : 
Expofed to the fire, they emitted copious white 
fumes, with a hiding or crackling noife ; and left a 
very fmall quantity of a reddifli powder. 
2. A mixture of folutions of gold and platina, be^ 
ing treated in the fame manner, ruby-coloured cry- 
flals were obtained, which appeared to be chiefly 
gold, with very little of the platina. 
Remark. 
