108 THE ROYAL SOCIETY OF CANADA 



These figures confirm the preliminary results and the follov/ing 

 conclusions may be drawn : 



(I) The amount of unsaturated hydrocarbons formed is always 

 small. 



(II) The optimum temperature is about 800°C. and a high space 

 velocity favours their formation. 



(III) The ethylene formed probably results from the decom- 

 position of ethane and not by any réaction between, carbon and 

 methane. 



