<1 2% Mr. Kir wan’s Experiments 
it cannot be fired by the ele&ric fpark, even when mixed with any 
proportion of refpirable air. I found a mixture of one part of he- 
patic air and 1,5 of common air to burn blue, without flafhing 
or detonating. During the combuftion fulphur is conftantly 
depofited, and a fmell of vitriolic air is perceived. A mixture of 
half hepatic and half nitrous air bums with a bluifh, green, 
and yellow lambent flame; fulphur is alfo depofited, and in 
proportion as this is formed, a candle dipped in this air burns 
more weakly, and is at laft extinguifhed. A mixture of two 
parts nitrous and one of hepatic air partially burns, with a 
green flame, and a candle is extinguifhed in the refiduum, 
which then reddens on coming in contact with atmofpheric air. 
I made a mixture of one part nitrous and one part hepatic air, 
and to this admitted one part alfo of common air; the inftant 
the common air was introduced, fulphur was precipitated, 
and the three meafures occupied the fpace of 2,4 meafures ; 
this burned on the furface with a wide greenifh flame, but 
the candle was extinguifhed when funk deeper. 
A mixture of four parts common air and one part hepatic 
burned blue and rapidly ; but a mixture of one part dephio- 
giflicated and one part hepatic, which had flood eight days, 
went off with a report as loud as that of a piflol, and fo Inflan- 
taneoufly that the colour of the flame could fcarce be difcerned. 
Every fpecies of hepatic air turns the tindiure of litmus red. 
M. Bergman feems to think, that, if this air were wafhed, 
it would not produce this effedl ; yet, when I had paffed two 
meafures of it through one of water, or when I had boiled it 
out of water impregnated with it, or even when I palled that 
which had already reddened litmus, into a frefh quantity of 
litmus, it {till preferved the fame property, which I therefore 
confider as eflfential to it. 
With 
