THE ELECTROMOTIVE PHENOMENA 299 



myomeres, may be conceived to be positive on 

 their longitudinal surfaces, and negative on their 

 cross-sections (Fig. 48). They are assumed to 

 have their negative surfaces turned towards the 

 ends of the muscle or nerve, and the positive 

 equatorial region turned towards the longitudi- 

 nal surface. A non-electric conducting substance 

 surrounds them. An electrode placed on the 

 longitudinal surface would touch only the posi- 

 tive sides, while an electrode placed on the cross- 



Fig. 49. Scheme of myomeres in an oblique section (Rosenthal). 



section would touch only the negative poles. 

 However small the muscle prism was made, the 

 relation would still be the same. Thus the dis- 

 tribution of potentials would correspond with 

 that actually observed. 



When the cross-section is oblique, the myo- 

 meres at the cross-section are exposed as shown 

 in Fig. 49, and the currents which pass from the 

 longitudinal surface of each myomere to its cross- 

 section are added to the main currents passing 



