134 



This arrangement liad tlie a(l\iuila<2,e llial iJ enabled me to repeat 

 the indirect stimnhilioii under very conslaid condilions. In this way 

 one succeeds in iieeping- (he organ in good condilion for 2 — 3 hours, 



Fig. 2. Apparatus for study of electrical 

 discharge in different fluids, gases 

 and temperature. 



Fig. 3. 

 lo = electr. organ 5 = string-galv.m. 



/ = slate-resistance i = induction-app. 



z;= volt-meter /)//i = apparatus for 



tv = resistance-box photogr. registrat. 



SO that if one stimidates once every 15 minutes the deviations of 

 the galvanometer remain cojistant. 



The discharge was led (o an ordinary resistance-box and a slate- 

 resistance (of 800,000 ii). From the resistance- box a circuit coidd 

 be branched off to the string-galvanometer. By means of a key, 

 connected with the recording apparatus, a definite potential diflference 

 could be thrown into the chief circuit for the purpose of testing the 

 movements of the string (Fig. 3). 



A tuning fork of 50 vibrations per second marked the time on 

 the photographical plate, while a very sensitive signal of Dkphez 

 indicated the moment of stimulation. The nerves were stimulated 

 by means of induction-shocks. Sometimes part of it was thrown into 

 the string-circuit so as to have the string itself mark the moment 

 of stimulation. 



It is clear that this method does not enable one to study the 

 question of the relation of a stimulus to its effect. 



This question has been thoroughly investigated by Fuji with the 

 oscillographion. 



In my experiments I could not state anything but the fact that a 

 weaker stimulus gave a less noticeable effect than a strong one and 



