C 6 *7 ] 
and the nofe of a bellows diredled obliquely upon 
the furface. The matter continued to flow, and fume 
copioufly, for fome hours ; at length became con- 
fident in an intenfe white heat, and fcarce emitted 
any more fumes, though flrongly blown on. The 
mafs, when grown cold, broke eafily, appeared very 
porous, blebby, of a dull grey colour, and weighed 
confiderably more than the quantity of platina em- 
ployed. 
Platina was likewife treated with crude antimony ; 
and the regulus, obtained from this mixture, difflated 
as the foregoing, with the fame event ; the platina 
not only refilling the antimonial femi-metal, but like- 
wife defending a part of it from the action of the fire 
and air, and refilling to melt, after a certain quantity 
had been difiipated. 
, 4. Deflagration of Zinc with Platina. 
A mixture of platina and zinc, expofed to a flrong 
fire, deflagrated, and appeared in violent agitation. 
This continued but a little time; the matter quickly 
became folid, and could no longer be made to flow; 
or the zinc, of which a confiderable proportion re- 
mained in it, to flame. The mafs was very brittle, 
dull-coloured, fpongy, and of no fpecific gravity. 
General Remarks. 
This extraordinary mineral, on which the mofl 
adlive fluxes, aflifted. by the mofl intenfe fires, have 
no effedl, melts perfectly with all the known metal- 
lic bodies ; unlefs arfenic, a fubflance impatient of a 
degree of heat fufficient to render itfelf fluid, is an 
exception. All the metals take up equal their own 
weight ; 
