42 Art. 1.- K. Fuji: 



The course of the curve representing tlie relation between tlie 

 height of the stimnkis and the height of the discharge resembles 

 that of the direct stimulus. Here we may remark that the modal 

 latent periods have very consistent values except in Curves No. 1, 

 No. 2 and No. o, in which, since the curves are very low, the 

 ineasurements were very inaccurate. 



In closing tliis section, tlie results of our experiments are 

 summarised as follows: — 



i.) The height of the discharge A slowly increases with the 

 increasing intensity of the stimulation current from zero. 



ii.) Then it increases very steeply, where it passes an inflexion 

 point; and then approaches an asymptotic value. 



iii.) With respect to the duration of the stinuilating current, 

 Hoorweg's decrement factor seems to l)e correct, but it is not clear 

 whether the constant ß in it does really depend on the strength of 

 the stimulating current or not. 



VI. Discharges by Two Successive Stimuli. 



Ah'eady in one of the preliminary experiments, we discovered 

 that M'hen two successive stimuli not too far apart in time from 

 each other are given to tlie nerve, the discharge l)y the second 

 stimulus shows greater delay compared witli the normal. A pair 

 of momentary stimuli which were caused by a contrivance on the 

 shaft of the registering drum were sent periodically, i.e. once in 

 each revolution, to the nerve. At first only the preceding one of 

 the pair, then the succeeding, and finally the pair together were 

 sent througli the nerve. These were photographed on the same 

 film. The second stimulus was so given that, if the two discharges 

 appeared at the normal delay, the second discharge should appear in 

 a position superposed on the descending branch of the first. But 

 from the film we saw, on the contrary, that the second dischai'ge 

 occurred after the first had been over. 



For the precise investigation of the phenomenon, we constructed 

 a special contrivance in our stimulation-apparatus, by means of 

 Avhich two consecutive momentary stimuli separated by a desired 



