220 Proceedings of the Eoyal Society of Edinburgh. [Sess. 
then it appears to follow inevitably that the energy must change discon - 
tinuonsly both in emission and absorption. 
My own position with regard to the Quantum Theory is clearly stated 
in the paper which I read before the Society in November 1920. I put 
forward the view that the “ quantum ” is itself essentially magnetic, being 
conditioned by the existence of discrete tubes of magnetic induction. “ It 
must not, however, be supposed that the view ‘ reconciles ’ the quantum 
theory and classical dynamics. My object is rather to seek to understand 
more clearly the nature of the quantum, whilst accepting the conclusion 
that some modification of the old theories is inevitable.” 
Professor Whittaker’s work is to be welcomed as a valuable contribution 
towards the attainment of that clearer understanding of the quantum which 
all physicists must desire. 
(Issued separately July 4 , 1922 .) 
