636 MR. EDWARD MATTHEY ON THE LIQUATION 
The sphere, which I call G, being cut equally into two, the following are the results 
from the various indicated portions of the hemisphere :— 
G. Gold. 900 parts. 
Palladium.100 „ 
Parts of gold in 1000 :— 
Outside. 
Intermediate. 
Centre. 
902 
900-3 
893'6 
901-6 
900-4 
901-6 
900 
901-5 
899 
899-5 
899-5 
901-4 
902 
Average . 901’1 
Maximum difference in tlie gold between centre and mean of outside, 7'5 per thousand. 
G. 
It seems therefore clearly demonstrated by these experiments that the metal 
palladium is driven towards the centre of the mass in alloys of gold and palladium 
in a similar manner, though not perhaps to the same extent, as platinum-gold alloys, 
and the experiments shown by the diagrams given prove this fact incontestably. 
The methods adopted for the determination of the gold in the respective platinum 
and palladium alloys were the following:— 
In the alloys of gold, 10 per cent., and platinum, 90 per cent. Two carefully 
weighed portions of the alloys to be analysed were weighed and cupelled with two and 
three-quarter times their weight of fine silver—in identically the same manner as in 
conducting the process of gold assaying—one of the resulting buttons being then 
“ parted ” in nitric acid, and the other by sulphuric acid. In the first instance, the 
whole of the platinum dissolves with the silver by employing two distinct treatments 
