310 



THE SO-CALLED SECONDARY ELECTROMOTIVE 



Example of an experiment on muscle. Sartorius, led in and off as 

 in the preceding- case of nerve. 



Finally, it may be stated that I have made a number of experi- 

 ments with Herr von Gendre's help, upon nerve and muscle led-off 

 intrapolarly and extrapolarly at the same time, in order to deter- 

 mine the time relations of the two phases. But as these experi- 

 ments offer no new point of view, I omit further reference to them. 



5. Explanation of the intrapolar and extrapolar after-currents 

 of Nerves and Muscles, together with further experiments. 



A. The after-currents which arise from true polarisation. 



Since its discovery by Peltier, it has been accepted by all obser- 

 vers that the opposed after-current, which appears in the 

 intrapolar region of a length of nerve or muscle, through which a 

 current has been led and broken, is due to internal galvanic polari- 

 sation. This current shows, in fact, unmistakeably all the peculia- 

 rities of a polarisation current. Especially noticeable is its rapid 

 decline, as evidenced by the fact, that only slight traces of it can be 

 found when a short time is allowed to elapse between the breaking 

 of the battery and the closure of the galvanometer circuit. The 



