[ 66 5 ] 
edges : The colour was very dark, with a faint pur- 
plifh caft. 
2. One part of platina and two of lead, covered 
with borax and black flux, and expofed to a gradual 
fire, in a wind furnace, did not come into fufion till 
the fire had been raifed to a flrong white heat : From 
the continuance of heat in this experiment the lofs 
was great, being nearly one-twenty- fourth of the 
mixture. The ingot proved hard and brittle, like the 
preceding,' but broke off a ftriated furface. 
3 . One ounce of platina and three of lead, treated 
in the fame manner, required ftill a very flrong fire 
for their perfect fufion ; and loft about on e- twenty- 
fixth. The metal broke lefs eafily than either of the 
preceding, and in fome meafure yielded to the ham- 
mer : The colour was fomewhat darker, and inclined 
more to purplifh. 
4. One part of platina and four of lead, being 
covered with black flux and common fait, and com- 
mitted to a wind furnace, the platina was not per- 
fectly taken up, till the fire had been raifed to a con- 
fiderably flrong white heat : The lofs was one-for- 
tieth. The fame proportions of the metals, injeCted 
into a fluid mixture of the flux and fait, previoufly 
brought to the above degree of heat, almofl inftantljr 
melted, and loft only one-hundred-and-fixtieth. The 
ingot was much tougher than of the foregoing, filed 
well, and cut tolerably finooth with a knife. Upon 
breaking, the upper part appeared compofed of 
bright plates, the lower of dark purplifh grains. 
y. One part of platina and eight of lead united 
eafily in a quick fire, and loft little or nothing. The 
metal worked and looked like very bad lead : On 
4 P breaking, 
