W. G. Miater—Estimation of Sulphur in Coal. 93 
Oxygen is passed in at 7, the tubes are disjointed at & and the 
tube holding the assay is then pushed in, till the platinum just 
reaches the heated zone. The a paratus being connected at k 
slow volatilization of the liquid is effected by cautiously apply- 
when the =p pene is disconnected at & to remove the tray or 
rops of it should be poured through a funnel-tube 
deposition of the sulphuric acid. 
he tubes d and ¢ are then rinsed into a beaker, this water is 
poured into 6, which is then thoroughly washed by the aid of 
the wash-bottle: the large rubber stopper is lifted from the 
bottle and the lower part of } rinsed; without removing the 
the bottle is carefu y washed. The solution obtained, whic 
weed not exceed 500 ce. is evaporated to a small volume, 
filtered if necessary and the sulphuric acid precipitated by barium 
chloride. The barium sulphate washes easily, as the solution 
Contains no nitrates or iret salts. Its purity is ascertained by 
treatment with water and a few drops of chlorhydric acid, warm- 
ing some time, gc and sews hinia In case the substance 
leaves an ash or residue in the tray, this must be dissolved 
there is no danger from explosions if care be taken to have the 
Combustion tube hot enough to ignite combustible vapor. 
the substance in the apparatus. 
€ writer found that when oxygen prepared from a mix- 
ture of potassium chlorate and manganese dioxide, or from the 
chlorate alone (no rubber stoppers or connections being em- 
loyed) stood of 
Tomine and a little water, the water gave a slight turbidity 
with barium chloride. Neither the bromine nor the solution 
of the chlorate gave reactions for sulphuric acid ; the mangauese 
