Physics and Chemistry. 109 
Schneider considers it probable that in fusing ferric oxyd with 
potassic or sodic carbonate similar compounds, containing oxygen 
in place of sulphur, are formed. 
When bismuth is used in the above process in place of iron, 
delicate light steel gray brilliant crystalline needles are formed 
which have the formula Bi, K,§,, or, 
S—K 
S=Biy"= 
5-—K 
This compound is easily and completely decomposed by chlorhy- 
dric acid with evolution of hydric sulphid. The author has 
obtained similar compounds containing copper, iron and copper, 
and platinum. They are beautifully crystalline and will form the 
subject of future more extended description.— Pogg. Ann., B. 136, 
460. Ww. G. 
obtained a substance having probably the empirical formula, 
and unchanged by it. Dilute chlorhydric acid colors them at once 
i u tash, but without evolution of 
any gas whatever. i m i 
tacked by boiling chlorhydric or nitric acid and but slowly by aqua 
regia. e original red body when heated in a current of 
gen loses 3 of its sulphur. e residue then gives up potash to 
chlorhydric acid, and the residue thus obtained loses all the re- 
maining sulphur, when heated in hydrogen, and leaves a mixture 
of tin and platinum. From this it appears that the last 4 of 
the sulphur is retained through the influence of the potash. The 
direct expression of the results of the analysis of the red compound 
kK Pt,S,. The simplest atomistic formula appears to be 
g: 
: 
the followin 
Pei—s 
Sn! Vieee ¢. 
Pt! —— S, 
Peis 
The action of chlorhydric acid on this salt is then readily explained, 
sce, without writing the whole formula, we see at once that 
