1557 above, hydrogen appears to exert a similar negative catalyzing effect, but not as pronounced, on the reaction between hydrogen and oxygen. Conclusions. The ignition temperatures of mixtures of: Hydrogen and oxygen, carbon monoxide and oxygen, hydrogen, oxygen and nitrogen, carbon monoxide, oxygen and nitrogen, and hydrogen, carbon monoxide and oxygen, were determined by the "adiabatic compression method," and the possible sources of error fully discussed. I t is shown how the ignition

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... rature of any gaseous mixture containing hydrogen, carbon monoxide, oxygen, and an inert gas, may be calculated. The reaction between hydrogen and oxygen is shown to be bimolecular and between carbon monoxide and oxygen, trimolecular. T h e velocity coefficient per 10' rise in temperature is calculated to be 1.31 at about 800' and 1.13 at about gooo for the reaction between hydrogen and oxygen, and 1.24 at about gooo and I . 14 a t about IOOOO for the reaction between carbon monoxide and oxygen. The reactions between hydrogen and oxygen in the presence of an excess of hydrogen and between carbon monoxide and oxygen in the presence of an excess of carbon monoxide do not follow the simple laws of chemical kinetics.