( 445 ) 
having already a value different from 0, if we put #—= Ae#*. For 
a stationary state and for the case of the bar mentioned in § 1, the 
member in question becomes 
dA dh 
(— Qh AX 4 "A ) gee Eee, whee STE) 
da dx 
As to the left hand side of the equation (10), it would become 0, 
if we were to substitute f — dek“. Here, we must therefore use 
the complete value (15), the deviation from Maxwerr's law being 
precisely the means by which this member may be made to become 
equal to (16). 
The occurrence of the factor § in this last expression makes it 
probable that the same factor will also appear in the function p. We 
shall therefore try to satisfy our equation by putting 
PSN Gan) ce ee ee sy (LZ) 
This leads to 
F (Ss M$) = Ae” + $x (r) 
and 
Ff. 4, $) =A e-tr? +8 y (r)), 
consequently, since 7’ =r, if we use (11), 
£63 1',5) —f 6, 1, 5) = — 2 r cos B cos f x (r), 
so that the first member of (10) becomes 
a 
—2nk ry foo GROND a a va UE) 
Denoting by w the angle between the velocity (&,n, 5), i.e. the 
line OP, and the axis of z, and by wp the angle between the planes 
QOP and X OP, I find for (18) 
„ 
Qa : 
— 2nR*r* y (7) foe D (cos B cos u + sin D sin u cos Wy) sin Hd Hd = 
9 
© 
== rt (7) cos waren RIE r (5): 
If this is equated to (16), the factor § disappears, so that y (7) may 
really be determined as a function of 7. Finally, putting 
1 
an Rt 
we draw from (15) and (17) 
Ennn Aten eee i( 2 AX — = + 9 1) 2 e—hr? | (20) 
da dre) r 
LEE Ve ast ive eneen (0) 
T must add that, as is easily deduced from (9), the quantity / 
defined by (19) may be called the mean length of the free paths of 
dA 
the electrons, and that, in the equation (20), the terms in 
Lv 
and 
