. A Compound of Sodium Cuprous Thiosulphate and 
Acetylene Cuprous Acetylide. (Preliminary notice), 
By KsnitipHusHan Buapuri, M.Sc. 
When a solution of sodium thiosulphate is added to one 
of copper acetate until the colour becomes pale green, and 
ever, completely soluble in water and hence cannot be washed 
with it. Its ‘solution in water has a blood-red colour. The 
by the addition of almost any salt; and in the case of some 
salts the precipitation is so complete that the supernatant 
liquid"is perfectly colourless. But curiously enough the sub- 
stance is as soluble in a concentrated solution of sodiu 
like gunpowder. 
On analysis one sample of the substance gave :— 
From 0°1664 grms.—0-03886 grms. of Na,SO, and 0-0915 
Cu,S; from 0°1819 grms:—0°2798 grms. of 
BaSO,,. 
Another sample of the substance gave :— 
From 0°1517 grms.—0-0847 grms. of Cu,8. 
,, 0°1668 —0°2580 ,, BaS0O,. 
From which the percentage of— 
Na=7°56, Cu=44°7 and S=21°2, 
