[ 643 ] 
2. The experiment was feveral times repeated, and 
varied : once, common fait was thrown on the fuel 
before the crucible, and its fumes ftrongly impell’d on 
the platina : fome platina was likewife placed before 
the nofe of the bellows in violently-excited fea-coal 
fires, fo ffrong as to almoft inftantly melt off a piece 
of the end of a forg’d iron rod, without effedt ; ex- 
cept that once there were a very few globular drops, 
about the fize of very fmall fhot : thefe broke eafily 
on the anvil, and look’d, both internally and exter- 
nally, like platina. 
Remark. It is probable, that the fufion here was 
owing to fome accidental admixture, poffibly iron : 
for the unmelted grains, expos’d afterwards to a fire 
rather more intenfe, fuffer’d no lenfible alteration. 
Experiment 6. 
Platina was likewife expos’d to the fire in con- 
junction with feveral fubftances, which are found to 
promote the fufion of other bodies, or to occafion 
confiderable alterations in them. 
1 . Platina mingled with powder’d charcoal, with 
compofitions of charcoal, foot, common fait, and 
wood allies, fubftances employ’d for changing iron 
into fteel ; fuffer’d no change in weight or appear- 
ance, whether urg’d with an intenfe fire, or cemented 
for many hours in a weaker one. 
2. Platina was injedted into melted borax, and 
urg’d with an intenfe fire for feveral hours, without 
undergoing any alteration. Nor had black flux, 
common fait, pure fix’d alcaline falfcs, or cauftic al- 
calies, any lenfible effedt. 
4 M 2 
3. Vi- 
