62 



PHYSIOLOGY OF MI X'LKS AN1> .\KI;\ I >. 



form of a iln'n tin-cad, through which the current may 

 pass. When, however, tlir miiM-le shorten*, the- qnick- 

 silvrr i- torn a\vay, and roinncs its ordinary rniv<-x 

 surface; and wlit-n, on thr extrusion of tin.- niusrU-, 



-c, 



I.XI'I IMMI M I MI; I in. I I I < I l;]< Ml AM III Ml N L 

 M| I I Ml. 



the lever a<niiu sinks, though the point // a-jain rests on 

 the platinum plate, yet the point </ remains separated 

 from the quicksilver l>y ;m intermediate air-filled space, 

 and the current remains permanent ly interrupted. 



It -till \\;\> to be explained lm\v the irritation of the 

 mu.-cle and the clo>in.r ,,(' t he time-determining current 



