MME 
KEEN | 
Fig. 1. Apparatus after Zorn (borrowed from a communication by Zorn). 
So it appeared that the nerve had become irresponsive after 48 
minutes by the effect of '/,°/, cocain solution. The process of the 
experiment will be seen from the curve in Fig. 2. 
Reading taken of the inductorium 
minutes 
Fig. 2. Effect of 1/,°/, hydrochloras cocain upon the nervus ischiadicus of a 
muscle-nerve preparation of Rana esculenta. 
Abcisga: Time in minutes. 
Ordinate: Stimulus required to make the muscle contract through indirect 
stimulation. 
The same experiment was repeated several times to the following 
effect : 
