ON BINOXALATE OF AMMONIA. 
135 
ART. XXII. — PROCESS FOR SEPARATING GOLD FROM 
PLATINA. By M. Kemp. 
The author has discovered that oxalic acid decomposes the 
solution of gold without exercising any action upon the solu- 
tion of platina. The two metals may be thus separated and 
their proportions determined, by dissolving in aqua regia, 
and precipitating the gold in a metallic state by oxalic acid, 
and the platina by formic acid. 
The difficulty heretofore experienced, in separating gold 
from platina, gives a great' importance to this process. 
A. 0. 
Ibid. 
ART. XXIII.— ON THE DECOMPOSITION OF THE BINOXA- 
LATE OF AMMONIA BY HEAT, AND THE PRODUCTS 
WHICH RESULT THEREFROM. By M. Balard. 
When crystallised Binoxalate of Ammonia is exposed to 
heat, or an oil bath, it enters into fusion and begins to de- 
compose at the temperature of 220° to 230° C. The fusion is 
at first observed in the portions of the salt, near to the side 
of the retort ; on introducing a rod into the tubulure of the re- 
tort and intermixing a portion of the fused oxalate with that 
which remains solid, the whole soon softens, then becomes 
fluid, afterwards pasty, and puffs up greatly, disengaging 
abundance of gas, which, by the agitation produced, maintains 
the uniformity of temperature and the regularity of the de- 
composition. This gas consists of a mixture of carbonic ox- 
