178 



I'UVSKC.o iV OF M!>d.I-:s AM> MCKVKS. 



The case >f organic tissues, with which we are con- 

 cerned, is of the latter sort ; for we have seen that 

 when (hrse an- iliserteil liel \veen ( he ends of a honio- 



<;eneo;i-. arch, electric action takes place under certain 

 circumstances. The f^ct that in other cases no such 

 action occurs will be intelligible after the account just 

 given, for we may assume that in such cases the two 

 points which are touched by the ends of the arch are 

 similar in tension. 



Let BODE (fig. 44) represent a section through 



E 



-b 



JJ 



D 



FIG. II. Ci UUI-;NT-< i uvi - \M> 1 1 N-K>N-< TI:\ i -. 



a body in which an electromotive force is present. For 

 the sake of simplicity we will assume that the body 



is a regular cylinder, and that the elect ro;nt i\c force 

 i- nt nated in its axis; then that which we show in 



the case "f I!('l>h' \\ill be e(|iially true of every 



ot her .-ect ion. Let the point .1 represent the seat, of 



elect roniot i\e force l which >et>the po>it i \ e elect ricit V 



in motion to\\ard the ri^ht. the negative electricity 

 toward the left. The \\hole body is t hen .icciipied by 



1 In (.rili-r ti. l,avf a pliv^iral l.asis fur tlii> elecl nuimi ivr t'on-c \\c 

 may iinaL'im- tin- cylinder tu cuiisisl nf a lluiil, and I liat at the i>niiit 



.1 is situated a body consisting 1ml f uf -/\].f, lalt' nf CM].] r. 



