PHENOMENA OF MUSCLE. 



243 



the researches tabulated below ; but the direction of the current 

 must not be changed in the course of an experiment. For, so 

 strong a current at its point of exit, impairs considerably the 

 susceptibility of the muscle substance for positive anodic polarisation. 

 Thus, when in an experiment the spot of muscle which had acted as 

 the point of entry for the descending current, served as the point 

 of exit for the stimulating ascending current, it showed much 

 weaker positive polarisation, and might even show negative polari- 

 sation, a circumstance of which I made mention in the preceding 

 communication. An exactly analogous experiment can be made 

 on another muscle with a descending current ; it is best to use the 

 other sartorius of the same frog. 



The following table gives examples of such a series of experiments. 

 The Roman numerals correspond to the order of the individual 

 experiments on the same muscle : 



i. 



Ascending current. 7 Daniells. Closing time 5 sees. Transmission time -026 sec. 

 to -034 sec. 



2. 



Descending current. 8 Daniells. Closing time 5 sees. Transmission time -026 sec. 

 to -034 sec. 



R 2, 



