PROFESSOR H. B. DIXON ON THE RATE OF EXPLOSION IN OASES. 127 
to carbonic oxide and steam, the observed rates are higher than those given by the 
formula. Again, when these mixtures are diluted with nitrogen the rates come out 
higher than the formula predicts. 
Table XXIII. — Marsh Gas and Oxygen with excess of Nitrogen added. 
Mixture. 
2 vols. methane I 
3 vols. oxygen. / 
CH, + 03 
With addition of 
1 vol. nitrogen. 
CHi+OgPN 
With addition of 
3 vols. nitrogen. 
OH, + 03 + N3 
Theory, 0 . . 
2387 
2211 
1958 
Found, V 
2470 
2349 
2154 
For pure marsh gas and oxygen, the calculated velocity is 3|- per cent, too low; 
when 3 volumes of nitrogen are added, the calculated velocity is 10 per cent, too low. 
The mixture cannot be detonated with a large excess of nitrogen. 
