54 ^ Mr, PoRRETT on the nature of the Salts 
R. Experiment ii. 0.5 of a cubic inch of sulphuretted hy- 
drogen gas, the same volume of Prussic acid gas, and 0.25 of 
a cubic inch of oxygen gas, were attempted to be exploded by 
the electric spark, but they did not form an explosive mix- 
ture in these proportions, I therefore added 0.125 of a cubic 
inch more of oxygen, and again passed the electric spark 
through them, an explosion now took place attended with a 
diminution of volume amounting to 0.5 of a cubic inch ; no 
red tinging acid was contained in the product of this experi- 
ment. 
S. Experiments 12, and 13. Hydrosulphuret of ammonia 
added to simple prussiate of ammonia, and to prussiate of 
mercury, did not occasion the formation of any of the red 
tinging acid. 
T. Experiments 14, 15, and 16. Sulphuret of carbon added 
to the two prussiates just mentioned, and also to liquid Prus- 
sic acid, was equally ineffectual as the hydrosulphuret. 
U. Experiments 17, 18, 19, and 20. Sulphur was added to 
the same three liquids as the sulphuret of carbon, some sul- 
phur was also kept in fusion while Prussic acid gas was passed 
through it, in neither of these cases was any chemical change 
effected. 
V. Experiments 21, 22, and 23. Hydroguretted sulphur was 
added to the same three liquids with no better success. 
W. Experiments 24, 25, and 26. Sulphur added to a strong 
solution of pure potash in the cold, so that no hydroguretted 
sulphur could be formed, was very sparingly dissolved in the 
alkali, the solution, or rather mixture of the two, was poured 
into each of the three liquids before mentioned, it did not alter 
the acid contained in them. 
