Monosulphid of Potassium and Bromid of Ethylene. 399 
-‘The bromid of sulphid of ethylene.—It has already been men- 
tioned that the sulphid of ethylene combines directly with bro- 
mine without disengagement of bromhydric acid. Whether this 
combination can take place in more than one proportion is a 
question of particular interest, and at the same time is one, 
which from the manner in which the union of the two bodies is 
ected can be easily resolved. 
When a solution of bromine and another of sulphid of ethy- 
lene in bisulphid of carbon are mixed together in different pro- 
portions, one or the other being largely in excess, a light yellow 
colored precipitate is formed, which always has the same compo- 
sition after it has been purified by washing with bisulphid of 
carbon. Of the preparations analyzed below, No. I. was forme 
in a solution containing bromine in excess, and No. II. in a so- 
lution containing an excess of sulphid of ethylene. 
Gram. Gram. Gram. 
I. 04596 substance taken; 01840 CO, and 00705 H,0 found. 
05864 “ “ 0-915 nd. 
: AgBr fou 
IL 04776 “ “ 08140 ‘“ “ 
a It Theory C,H,SBr, 
© -==. 1092 dace 10°91 
1S eS Se of (3 peat "88 
Br == 72-59 72:53 72°72 
8 Me 14°54 
100-00 
heat at a temperature considerably under 100° C., ana even at 
the ordinar temperature it is decomposed with disengagement 
of brombydric acid, after standing several months in a seal 
Itis worthy of remark that the bromid of sulphid of ethylene 
Ssents no analogy in its properties with a body having the 
mula, C,H ,SCl,, which was obtained by Guthrie by com- 
Ba, directly ethylene gas with the perchlorid of sulphur, 
: The purity in which the foregoing compounds are obtained by 
ae Addition of bromine Kid Oyen to the sulphid of ethy- 
ae proves a fact which could not be demonstrated by a simple 
Analysis of the latter, and only with small degree of accuracy by 
: ‘determination of density of vapor, namely, that this sulphid is 
2 od chemical) y pure compound, and not a mixture of various stages 
