The Action of Heat upon Ethylene. 

 Table I. The Action of Heat upon flowing Ethylene. 



perature a slower rate of flow was attended by generation of any 

 saturated hydrocarbons higher than methane. 



In order to do this, the same arrangement of apparatus was em- 

 ployed, but the rate of flow of ethylene was diminished to 4'2 c.c. per 

 minute, the gas, after heating, being collected as before, and an 

 analysis made in which the saturated hydrocarbons were calculated 

 from the results of the paraffin absorption and subsequent explosion. 

 A second analysis was then made of the heated gas without any 

 paraffin absorption, and the volume of carbon dioxide formed on 

 explosion calculated as methane. If the volume so obtained is found 

 to be greater than that originally given by the combined paraffin 

 absorption and subsequent explosion, it is held to be evidence' that 

 some higher member of the paraffin series must be present. In order 

 to ascertain if any unsaturated hydrocarbon other than ethylene is 

 present in the gas after heating, a sample of the gas is exploded 

 with oxygen, and the carbon dioxide estimated ; should the amount 

 formed exceed the carbon dioxide calculated from the second analysis, 

 it may be taken as evidence that an unsaturated hydrocarbon higher 

 than ethylene is present. 



