OF METALS OF THE PLATINUM GROUP. 
G35 
Palladium-Gold Alloys. 
It is not an easy matter to obtain trustworthy assays from alloys of gold and 
palladium, and this fact first called my attention to the liquation of this metal from 
gold. 
I melted an alloy of ninety parts pure gold with ten parts of pure palladium in a 
plumbago crucible in a wincl-oil furnace (several times to ensure mixture), and then 
cast this into a spherical mould, which gave a sphere of about 5 kilogs. of the alloy. 
This sphere, which I call F, was cut into halves. The following are the determina¬ 
tions of the gold results from various parts of the hemisphere—the palladium can 
safely be taken by the difference :— 
F. Gold. 900 parts. 
Palladium.100 ,, 
Parts of gold in 1000 :— 
Outside. 
Intermediate. 
Centre. 
902-5 
901-2 
902 
899-2 
902-4 
900-3 
897 
902-1 
900 
902 
901- 9 
902- 5 
902-3 
Average . 902'2 
Maximum difference in the gold between centre and mean of outside, 5"2 per thousand. 
F 
This same metal was now re-melted under the oxyhydrogeri flame in a lime furnace, 
and re-cast into the same spherical iron mould as before, the alloy therefore was at a 
much higher temperature than in the previous case. 
4 M 2 
