114 PHYSIOLOGY (>F Ml SCLF.S AND .NKKV1-. 



in tin' nerve i- exposed to the irritation. (I,,- muscle in 

 thi< case also describes tin- curve of its pukition ,,n 



tin- rajiidly mo\ ed plate of tin- myograph. Arranging 

 matters BO thai two curves of pulsation arc allowed 

 to describe thenisi'lve- in immediate sequence, hut with 

 the dil'i'ereiice that the nerve is irritated in one case at 

 a point near the muscle, but in the other case at a 

 point far from the muscle, two curves will lie obtained 

 on the plate of the myograph, which will appear ex- 

 actly alike but yet will not cover each other. On the 

 contrary, they are everywhere somewhat separated 

 from each oti;"r, as is shown in figure 29. l In this 



ll " 



I 10. _".'. PROPAGATION or THE Kxrm.MF.XT WITHIN M i:\ I:R. 



figure, a b c is the curve lirst described, on irritation 

 of the nearer portion of the nerve; in order to dis- 

 tinguish it from the other it is marked by small nicks; 

 a' b' c' represent s t he curve indicated immediately after 

 the former, but obtained as the result of the irritation 

 of a port ion of the nerve remote from the muscle. The 

 ond curve is seen to lie somewhat separated from the 

 other; it does not commence so soon after the moment 

 of irritat ion ( \\hich i> indicated by the vertical stroke o r. 

 that i<. a longer time elap-ed bet \\ ecu t lie moment of 



1 Tin- curves in \\'- r . '-".' \\ 'liin <} \\lim tlic glass \ 



mn\ri| niori- r;i|iilly. so lli:il ll.ry :\\-\ i'.ir ninrc rxicmlrd than Ihi'.-t: 

 in li'j ni'i- 1 s. 



