( 115 ) 
little influence on the distribution of the energy. Then I have con- 
fined myself to treating one dimension only, and this has induced 
Ken +- Gm 
me to omit the terms If, however, we admit electric and 
1 
magnetic masses into the space, statical forces may occur. When 
analysed with the aid of Fourtmr’s integrals these statical forces 
actually yield a distribution of the energy over the different wave- 
lengths. Yet they do not contribute to the propagation of radiation, 
the distribution of which we wish to investigate. It is for this reason 
that I have preferred a distribution in time to one in space. 
So we consider the component / in a certain point during the time 
between the moments ¢=0O and t=t,. This time we think divided 
into 2 equal parts T and the values of / during those parts we call 
respectively “/,, fas fa. er fn Then the index of probability gets 
the following value: 
1 
ww 1 d je 
En in Pe pL ae Mee aia fet, 
en aan af dt Ka) 
If we wish to make the agreement of this equation with equation 
(8) as great as possible, we have to give to / in this equation 4a |”? 
times the value it has in equation (8); this follows from the equations 
(10) and (15). 
Now we will proceed to the investigation of the distribution of 
the energy over the different periods, included in equation (8a). To 
that purpose we represent / as a function of ¢ during the space of 
time between ¢=o0 and ¢=4,, by means of the integrals of Fourier. 
As we will begin with treating f as a discontinuous function, determ- 
ined by the » values /,, f,...fn, we will represent the integral as 
a sum, which only becomes an integral if we make 7 assume the 
limiting value ©. Therefore in the expression 
I (t) =f Fw) {sin (ug) sin (gt) + cos (ug) cos (gt) du dy, « + (26) 
in which the limits for w are O and ¢, and those for gare Oand o , 
t 
we will replace u by — v or by tw and du by + where v represents 
n 
the series of the integers between O and 7. 
So we get 
vn 
Hi (6) =e = fo {sin (aq) sin (qt) + cos (eg) cos (qt)} dq. 
If we wish to separate in this equation the energy for a deter- 
