Muriat of Potash. 239 
mixture with rosin or gum. The sulphuric acid 
inflamed this mixture, but the nitrous acid did not. 
EXPERIMENT XVII.’ WITH ETHER, 
A few drops of ether on about two grains of the 
salt rubbed to a very fine powder, produced no de- 
tonation by friction. The sulphuric or nitrous 
- acids poured suddenly upon it produced flame. 
EXPERIMENT XVIII. WITH IRON-FILINGS. 
These alone rubbed with the salt produced no 
detonation by simple friction; but two grains of 
the salt, one grain of iron-filings, and half a grain of 
sulphur, being well rubbed together, about a quarter 
of a grain of this mixture exploded violently with 
friction. The sulphuric acid added, caused a few 
sparks to appear; but the nitrous acid did not pro- 
duce any. Varying the above proportions did not 
appear to improve the detonating gag of the 
mixture. 
EXPERIMENT XIX. WITH AURUM MUSIVUM. 
Equal parts of this substance and of the salt deto- 
nated strongly with flame, on being rubbed toge- 
ther in an iron mortar; a very slight friction was ne- 
cessary. The sulphuric acid gave a small flame, 
but with the nitrous I could not procure any. 
From the foregoing experiments, I think, we may 
venture to conclude, that the oxygenated muriat 
