Tr-ATK CVI. 



FIG. 282. Diagram of the curve of teta- 

 nus. 6, the line drawn by the point of 

 the lever connected with the muncle ; . 

 the line of the marking lever. The record- 

 ing surface is supposed to be moving 

 slowly. The line m marks the commence- 

 ment of stimulation, and also of the con- 

 traction (the movement not being suffi- 

 ciently rapid to show the latent period) ; 

 ml, the cessation of stimulation aud the 

 commencement of relaxation; m3, the 

 return of the muscle to its former length. 

 The straight line, which is the continua- 

 tion of 6 from m to m3, in the line 

 which would have been described by the 

 muscle in the absence of all contraction. 



PIG. 283. Lower part of large figure. 

 Curve of tetanus, showing the individual 

 contractions. Below are seen t.he vibra- 

 tions o( a recording tuning-fork. 



FIG. 284.- Upper part of large figure. 

 Curves illustrating the increased extensi- 

 bility of a muscle during tetanus. 



FIG. 285. Muscles and nerves of frog, 

 arranged for the experiment of the 

 "rheoscopic frog." 



