390 
MINUTES OF PROCEEDINGS OF 
By applying the formulae of the gasometric methods already mentioned in 
the analysis of gun cotton, since the gases are qualitatively the same, the 
values are obtained, for carbonic oxide =5*21, hydrogen =3*03, marsh-gas 
= 1*38, and nitrogen =19*18. 
Hence the total gas calculated for 100 parts consisted of— 
42*74 vols. Carbonic acid 
0*86 
„ Sulphuretted hydrogen 
10*19 
„ Carbonic oxide 
2*70 
„ Marsh-gas 
5*93 
„ Hydrogen 
37*58 
„ Nitrogen 
100*00 
The determination of the solid residue in the mortar was effected, after 
removing the gases, by digestion with water, which was drawn off through a 
tap in the bottom and rapidly filtered. 
The results of the analyses were as follows 
1. Sulphide of Potassium. The entire filtered liquid was digested in 
three large boiling flasks with well-ignited oxide of copper, thereupon 
filtered, and the residue dissolved in fuming nitric acid. Treated with 
nitrate of baryta, it gave 0*1015 grm. of sulphate of baryta, which cor¬ 
responds to 0*0478 grm. sulphide of potassium in the residue of 36*8366 
grms. powder. 
The liquid filtered from the oxide of copper was made up to 6 litres for 
the sake of further investigation. 
2. Carlonic Acid. A litre of this liquid gave with nitrate of silver a 
precipitate of carbonate and sulphide of silver. Treated with ammonia, the 
carbonate dissolved, and was separated from sulphide by a weighed filter, 
and precipitated in the filtrate as chloride of silver by means of hydrochloric 
acid. Its weight amounted to 3-0475 grms., which corresponds to 0*4687 
grm. combined carbonic acid; hence in the entire residue there were 2*8126 
grms. combined carbonic acid. 
As a control, the carbonic acid was determined by chloride of manganese 
by mixing a litre of the liquid with a solution of this salt which had been 
previously fused; a precipitate of carbonate of manganese was obtained, the 
carbonic acid of which, determined in the usual manner, corresponded to 
2*8337 grms. in the entire residue. 
3. Hyposulphite of Potash. The sulphide of silver (2) weighed on the 
tared filter, when dried at 120°, 0*2261 grm., which corresponds to 0*1733 
grm. hyposulphite of potash; hence the entire residue contained 1*0400 
grm. hyposulphite of potash. 
A determination of the hyposulphite was also made by metrical analysis. 
A litre of the solution was acidulated with acetic acid, mixed with starch, and 
determined by means of a standard solution of iodine. A litre required 
