298 Gold alloyed with Rhodium. 
Art. X.—Analysis of a specimen of Gold, found to be al- 
loyed with Rhodium. By Prof. del Rio, of Mexico.* 
Or gold of 24 carats, alloyed with-at least a third part of 
rhodium. 
In 1810, Mr. Cloud, refiner [now director] of the mint 
at Philadelphia, discovered that two ingots from Brazil were 
alloys of gold with palladium: we have here one of gol 
with rhodium ; a discovery hitherto unknown in Europe, 
like numberless other remarkable things which, under the 
auspices of liberty, will be brought to light in a country so 
extensive and highly favoured by nature. In Mr. Cloud’s 
analysis it is observable, that he neither gives the propor- 
tional parts, nor even the sp. gr. of the alloy. 
L 
Having treated 192.2 grains of an alloy of gold from the 
smelting house, the sp. gr. of which, according to the Che- 
valier Mendez, was 15.40, with aqua regia, or hydro. chloro- 
nitric acid, a sediment of chloride of silver was formed, 
fe gold was separated by ether, and 
a as observed, which sometimes floated up~ 
on the ; as Was natural, a metimes was found below 
the aqua regia ; which phenomenon certainly deserves a fur- 
ther examination 
inking, then, that it was still an alloy, by means of bo- 
with globules of a tin-white color. A lixiviam was made 
-* Translated from the Sol, of Dec. 11, 1994 
. 24, by Dr. Wm. Suitu, of the 
an eS; BARS vend before the New-York Soiridies of Nat. Hist. 8th May, 
eae Journal ers — “ sent to Prof. SitLutany, for publication in the Amert 
