[ 6 44 ] 
3. Vitreous matters were no more powerful than 
the faline. Platina was kept in ftrong fires, for ievera! 
hours, with common green glals, with glafs of anti- 
mony, and with glafs of lead, without feeming to be 
in the lead: adted upon by either. 
4. Platina was likewife ftratified with plafier of 
Paris, a powerful flux for the moft difficultly-fufible 
metallic body hitherto known, forg’d iron ; as all'o 
with quicklime, and with calcin’d flint ; with as little 
effedt as in the former trials. 
Experment 7. 
Nitre, which reduces all the known metallic bo- 
dies, except gold and filver, into a calx, was mix’d 
with an equal weight of platina, the mixture injedted 
into a flrongly- ignited crucible, and the fire kept up 
for a considerable time ; no deflagration happen’d ; 
and the platina, freed from the fait by repeated ab- 
lutions with water, prov’d of the fame weight and 
appearance as at fil'd. 
Experiment 8. 
1. An ounce of platina was fpread upon twice its 
weight of fulphur, with which fome powder'd char- 
coal had been previoufly mix’d to prevent its becom- 
ing fluid in the fire fo as to fuffer the platina to fub- 
fide. The crucible, having another with a hole in 
the bottom inverted into its mouth, was kept in a ce- 
menting furnace for feveral hours, when the fulphur 
was found to have entirely exhal’d, leaving the pla- 
tina feparable from the charcoal by wafhing, without 
alteration or diminution. 
I 
2. We 
