1895.] 



The A ction of Heat upon Ethylene. 



399 



On calculating these percentages for the change in volume, we 

 obtain the following results : 



The ethylene taken only contained 97'85 per cent, of the hydro- 

 carbon, hence 



and calculating this to percentage of total ethylene decomposed 



which shows that dilution has practically no effect in retarding the 

 decomposition until 75 per cent, of diluent is present, and also clearly 



