6 o Mr. Davy’s Lecture on some new analytical Researches 
process for nearly an hour, a globule equal to about the tenth 
of an inch in diameter was obtained, which, when examined, 
was found to be sulphuretted hydrogene. 
This result perfectly coincided with those which have been 
just mentioned ; but as the sulphur that I had used was merely 
in its common state, and as the ingenious experiments of Dr. 
Thomson have shewn that sulphur in certain forms may con- 
tain water, I did not venture, at that time, to form any con- 
clusion upon the subject. 
In the summer of the present year, I repeated the experi- 
ment with every precaution. The sulphur that I employed 
was Sicilian sulphur, that had been recently sublimed in a re- 
tort filled with nitrogene gas, and that had been kept hot till 
the moment that it was used. The power applied was that of 
the battery of five hundred double plates of six inches, highly 
charged. In this case the action was most intense, the 
heat strong, and the light extremely brilliant ; the sulphur 
soon entered into ebullition, elastic matter was formed in 
great quantities, much of which was permanent ; and the 
sulphur, from being of a pure yellow, became of a deep red 
brown tint. 
The gas, as in the former instance, proved to be sulphu- 
retted hydrogene. The platina wires were considerably 
acted upon ; the sulphur, at its point of contact with them, 
had obtained the power of reddening moistened litmus 
paper. 
I endeavoured to ascertain the quantity of sulphuretted hy- 
drogene evolved in this way from a given quantity of sulphur, 
and for this purpose, I electrized a quantity equal to about 
two hundred grains in an apparatus of the kind I have just 
