264 THE ROYAL SOCIETY OF CANADA 



linking the reacting substances in a molecular compound where 

 opportunity is afforded for the radicals in question to interchange. 



The fact that alcohol does not combine with the ether hydro- 

 bromide in the proportion one to one is to be expected since no reaction 

 between ethyl alcohol and ethyl ether can be formulated representing 

 an interchange of radicals in the manner of the two reactions dis- 

 cussed above. 



A termolecular compound between ether, hydrobromic acid and 

 water has been isolated. It has been pointed out that the explanation 

 by intermediate compound formation of the assistance of a chemical 

 reaction by the presence of an apparently non-reacting substance 

 finds here a further illustration. 



