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XVI. On the Liquation of Metals of the Platinum Group. 
By Edward Matthey, F.S.A., F.C.S., Assoc. Roy. Sch. of Mines. 
Communicated by Sir G. G. Stokes, Bart., F.P.S. 
Received March 3,—Read May 5, 1892. 
In the present paper, which is a continuation of a former one which has already been 
submitted to the Royal Society and has been published in the “ Proceedings,”* an 
attempt is made to ascertain whether liquation occurs in alloys of the rarer metals, 
notably in those of platinum, with palladium, and with rhodium, and of gold with 
aluminium. 
In the paper communicated to the Royal Society in 1890 upon this subject, I stated 
that ninety parts of fine gold melted with ten parts of pure platinum, and cast into 
a spherical mould showed a liquation of the platinum to the centre of the sphere, as 
shown in Diagram C in that paper. 
Subjoined are the full details proving that such liquation occurred. 
A. Gold . 
Platinum 
900 parts. 
100 
33 
Parts in 1000 of gold :— 
Ontside. 
Intermediate. 
Centre. 
903 
888 
845 
908 
888-5 
905 
902-5 
905 
900 
Average . 903 - 9 
Maximum difference in the gold between centre and mean of outside, 58'9 per thousand. 
* ‘ Proceedings of the Royal Society,’ 1890, vol. 47, pp. 180-186. 
1.12.92 
