796 LEWIS: STUDIES IN CATALYSIS. PART V. LXX--Studies irb Catalysis. Part V. Quantitative Expressions f o r t h e Velocity , Temperaturecoeflcient, and E f e c t of the Cutalyst from the Point of View of the Radiation Hypothesis. By WILLIAM CUDMORE MCCULLAGH LEWIS. THE well-known fact that the velocity of an ordinary or thermal reaction is very sensitive to changes in temperature indicates that ultimately velocity and temperature are due t o a common cause, both being manifestations of a

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... mode of distribution of heat energy, characteristic of the material system in question. It has long been recognised t h a t the influence of temperature on reaction-