59 
Sir H. Davy’s researches on flame. 
is correct, and for the purpose of ascertaining the general 
phenomena of the effects of the mixture of gaseous substances 
upon explosion and combustion. 
I took given volumes of a mixture of two parts of hydro- 
gene and one part of oxygene by measure, and diluting them 
with various quantities of different elastic fluids, I ascertained 
at what degree of dilution the power of inflammation by a 
strong spark from a Leyden phial was destroyed. I found 
that for one of the mixture inflammation was prevented by 
Of Hydrogene, about 8 
Oxygene g 
Nitrous oxide - - 11 
Carburetted hydrogene - i 
Sulphuretted hydrogene - 2 
Olefiant gas - - a 
Muriatic acid gas - 2 
Silicated fluoric acid gas - f- 
Inflammation took place when the mixtures contained of 
Hydrogene 6 
Oxygene 7 
Nitrous oxide - - - 10 
Carburetted hydrogene - a 
Olefiant gas - a 
Sulphuretted hydrogene - iA 
Muriatic acid gas - - iA 
Fluoric acid gas - - - a 
I hope to be able to repeat these experiments with more 
precision at no distant time ; the results are not sufficiently 
exact to lay the foundation for any calculations on the rela- 
tive cooling powers of equal volumes of the gases, but they 
I 2 
