10 Dixon & 'Lowe, Experimetits on Abel's theory. 



From the above experiments it may, therefore, be 

 concluded : — 



1. That the presence of a non-combustible substance 



does not cause the ignition of a weak gas mixture 

 which is not ignited by the flame or a spark. 



2. That if any local combustion takes place on the 



dust, causing self-heating, such an action causes 

 the remainder of the gas to be less explosive, and 

 not more explosive. 



