837 
be represented as function of Sommurrenp’s “spherical” quanta-quan - 
tities alone; other adiabatic invariants containing the quantities f, 
and ¢, are essential in this case. 
I am fully conscious of the fact, that by the above considerations 
the difficulties which still beset the theory of quanta are in no way 
removed, but only shifted. Still it seems to me that even the possi- 
bility of such displacement deserves attention. Moreover | expect 
that in special cases the general theory tentatively sketched out here 
may be found useful. 
Physical Laboratory of the University. Petrograd, April 1, 1920. 
