W. @. Mixter—Estimation of Sulphur in Coal. 95 
used as an imitation of coal, which should contain a known 
amount of sulphur. 
The sulphur used in Nos. 8, 4, 5 and 6 was purified by erys- 
tallization from carbon disulphide solution and fused. It was 
ase in a narrow weighed glass tube from 5 to 7 cm. long, 
led, allowed to cool and the whole weighed. During the 
combustion of No. 4, the sulphur volatilized so rapidly at one 
time that a portion escaped unburned, and formed a coating in 
1€ carbon disulphide was the commercial article purified 
by distillation from calcium chloride and quick lime. he 
three inches long with a very fine bore. The end of this neck 
was broken off, and the open point was thrust into a cylinder 
of platinum sponge wrapped in foil, and the whole was quickly 
Placed in the combustion tube as has been described. 
yee powdered bituminous coal was burned in a tray. In 
Exp. No. 10 some tarry matter passed into the condenser. No 
sulphur was found in the reddish ash, which amounted to 
5°57 and 5-29 per cents. 
The wool was from South Down sheep. It was purified by 
washing with soap and afterward with ether, and was dried at 
212°, “Wool swells so by heat that it cannot conveniently be 
burned in an open tray. No. 11 was contained in a glass tube 
Sealed at one end. After the volatile matters had been burned 
off, the tube was taken from the apparatus, the closed end was 
soxen and the charred residue mostly transferred to a tray, 
which together with the tube was returned to the combustion 
Sulphate was treated as above described. The precipitates had notwithstanding a 
The h color and corresponded to 51°78 and 51°63 per cent. of sulphur respectively. 
y yh d were accordingly free fr 
elded nothing to dilute chlorhydric acid 
7 g barhvin-ealta ey : paca ing to ion of Mitscherlich 
(Jour. Prakt Chem. 83, 456), dissolved in strong sulphuric acid, thrown down by 
", wash again weighed. They were now free from and 
- 
ferric oxide was slightly washed with water, then fused wi 
ae aneously in the Am. Kd. of Fresenius’ Quantitative Analysis, p. 525, from 
x, 59, vnished by Prof, Allen, and in a paper by Fresenius in his Zeitschrift, 
