(471 ) 
consequently only one of the constants having been changed. 
The stimulus, acting on the second neuron is formed now by 
this effect £). 
The effect of the stimulus on the second neuron may be repre- 
sented by 
Ey == ao ar Co € . . . . . . . ° (3) 
Or, if we give to g the value from (2) this becomes: 
— bj Cà be ie a: 
Hy = dg — Cg & 
(4) 
In this form the formula (4) is unfit for use. But we may first 
alter it a little to: 
—bR 
— a, Dz by cy 
Ey = dg — Caê IK: 
and finally to: 
3 
garens B cl AGE! AY 
in which 
— a, by 
k= cg € and /? = by cj 
Expanding the exponential form in an infinite convergent series, 
we obtain: 
2b, 
—b,R 1 ira R 1 —3),R 
Batlle | +58 "+ of% tee). 6) 
Neglecting the higher terms, and retaining only the two first, 
this expression is simplified to: 
as 
Ey = as — (he Meetnet NS te oh (A) 
wherein : 
az = dy —k en fy ek Zp. 
Which last expression (7) is perfectly identical to (1) as regards 
the form, only the constants having been changed. 
We still have to account for the possible consequences of ne- 
glecting the Std and following terms in the series of formula (6). 
31* 
