if = 6n t (fc.-ft)- 
The system of equations giving the time-variability of the «’s and 
0’s, is now: 
where N is put instead of 3w x . 
From tills system it appears at once that: 
therefore 
a, ~h a t = constant. 
So we put: 
= R* h'S , «, = < hr (1 -£)• 
Furthermore according to §4: 
i a« t * -f- 6a, « 2 + y c« 2 * -f p' 6* a, -f a, 2 cos if = consJan* 
is an integral of the system. 
By introduction of 5 this integral takes the form of: 
S^S(i-S)«» v = 1 & + ?? + ••,.(**) 
