150 GENERAL PROPERTIES OF LIVING TISSUES 



against the smoked surface in the same vertical 

 line. Let the nerve rest on the non-polarizable 

 electrodes. In the remaining two posts in the 

 moist chamber fasten stimulating electrodes. 

 Connect the latter to the inductorium, arranged 

 for tetanizing currents, short-circuiting key closed. 

 Bring the stimulating electrodes against the nerve 

 between the non-polarizable electrodes and the 



Fig. 41. 



muscle. Let the secondary coil be at such a dis- 

 tance that the tetanizing current will be just 

 below the threshold value. Turn the pole-changer 

 so that the anode shall be next the tetanizing 

 electrodes. Make and break the galvanic current, 

 recording the contraction on a slowly moving 

 drum. Now open the short-circuiting key, and 

 after half a minute, and while the sub-minimal 

 tetanizing current is still passing through the 



