Gold alloyed with Rhodium: 301 
but only a double flesh-coloured salt, which could not be 
crystallized, and which, on drying, resembled pale gray spu- 
mous iron. It could not be reduced with the blowpipe by 
citizen Mendez; and, treated with borax, yielded only a yel- 
lowish-green glass. 
It is seen then, that neither ether, nor muriate of ammonia, 
is well adapted to the attainment of a ready and exact sepa- 
ration of the rhodium; I therefore adverted to what 
Wollaston says, viz. that it does not amalgamate with mer= 
eury. 
iil. | ° 
Accordingly, citizen Mendez submitted to cupellation, an 
alloy of gold, with rhodium and copper, which was very 
great regard for the opinion of Berzelius, but truth is to be 
more regarded. Howmuchsoever the amalgam was washed, 
the regulus of the alloy, afier becoming red hot, (rusentado,) 
exhibited a black spot of rhodium on the bottom, and after 
fusion with nitre, weighed 49.7; its sp. gr. according to 
citizen Mendez, was 15, and the weight of the green oxyde, 
2.4 grains. I suppose that the sp. gr. was less, on account 
of its containing three eighths of a grain of silver. The infe- 
rence is clear, that rhodium amalgamates through the inter- 
medium of gold, although it does not amalgamate per se. 
IV. 
Having seen that neither the protosulphate of iron nor the 
oxalic acid, precipitated the rhodium, I dissolved in aqua = 
gia, the button of 66.13 grains, whose sp. gr. according to 
