302 Gold alloyed with Rhodium. 
Chevalier Mendez, was 15.48, without failing to notice that, 
on being hammered, it produced spots of a tin-white color 
on the yellow bottom; a proof of the alloy not being uni- 
form ; and it yielded half a grain of muriate of silver, which 
took more, as will be seen by the result, and a precipitate was 
formed with the protosulphate of iron, and the reduced button 
weighed 30.7; its sp. gr. being 19.07. I added more of 
the protosulphate to the solution, and it became like ink ; 
and by refraction in the sun’s rays it turned red, with great 
effervescence and separation of deutoxyd of azote, and when 
this ceased it became clear. Ina order to expel the nitric and 
muriatic acids, I distilled to dryness, and having added water, 
a great part of the sub-sulphate of iron remained without being 
dissolved. By adding a little sulphuric acid, and boiling, 
the whole was dissolved, the liquid assuming a faint carnation 
colour. Then [ put in a small plate of iron, which became 
copper-red, but by washing in distilled water, the red coating 
was destroyed, and an indefinable and highly fetid odour was 
exhaled, which certainly was not that of roses; the same as 
that emitted by throwing water on that which I fused with 
potash; so that the Greek name which has been given to it, 
their reduction to the deutoxyde by borax, as I have some- 
where read, they came out green glass... Considering them, 
therefore, as metallic, (and if they were not so, they nearly 
approached that state,) there results 25.4 per cent. of rho- 
‘dium, without reckoning what remained in the gold. I re- 
collect that I took the lower half of the solution, which bad 
remained long undisturbed. Would it thus become charged 
with more gold and less rhodium? I am inclined to this 
opinion so much more, as from the fourth part of this so- 
ution, precipitated with muriate of ammonia, which should 
have contained 16.5 of alloy, there could not be obtained 
- more than 9.3 of gold, which give 43 of rhodium in 100 of 
* The name appc pes 
appears to have been given by Dr. Wollaston, “ from the rost 
colour of a dilute solution of the salts coutatadang? it*—Tr. 
