L'O'J PHYSIOLOGY OF Ml'SCLKS AND NKKVES. 



CHAPTER XII. 



1. Negative variation <>f tin- mnscle-cnrrenl : L'. Living muscle is 



alont" elrrlrically active ; 3. 1'aivli <' niiminy : t. Srr, .ndavy ]>ul- 

 and M'cn Hilary tetanus; 5. (ilands and tlu-ir currents. 



1. Tin- p iwerful current alVorded by an entire ni. ;/as- 



trni-iiniiiii* enables US to answer the iin])ort:int ijllest ioll 



as to the character of dectric phenomena during con- 



traction, All that is necessary is to pivp'V.v this muscle, 

 together with its nerve, and to in.-ert its upper and 

 lower ends liet \\een (he pads of the diverting \ < ssel 

 already described, and then to place the nerve mi two 

 wires so that ^t ean lie irritated In inductive currents; 

 it, must then liecome evident whether the activity of 

 the muscle has any influence on its electric action or 

 not. 



In order to carry out the experiment, lei us snppo-r 

 the muscle, as shown in ti^. 5,1, placed between the 

 pad< of a diverting vessel, these pads bein^ brought 

 somewhat near each other, so that the contact of the 

 muscle with the pads is not di>t;irbed by the con- 

 (raetion of (he former. The nerve, which has been 

 f racted with the muscle, is laid on t wo wires which 

 are connected \vilh the >. <-oiidary spiral of the induct he 

 apparatus. A key, iiiM-rted between the nerve and (he 

 -piral. r- filial es the inductive ciirreiils so that the ner\e 



i- not excited. \Vhen all i- arranged, and the multi- 



