THE NERVELESS MUSCLE 



37 



muscles may be used with advantage instead of the adductor pre- 

 paration described. 



Another method of obtaining the curve of swelling of a contracting 

 muscle, better adapted, however, for mammalian muscle than for the 

 frog, is to use the pince myographique or myographic forceps of Marey 

 (Fig. 37). The muscle is grasped by this, and its contraction affects 



FIG. 37. Myographic forceps of Marey. F, Forceps for grasping the muscle 

 the contraction of which is to be recorded. The two blades of the forceps 

 are drawn together by an india-rubber band. T, receiving tambour, the 

 air in which is compressed by the swelling of the muscle, and from which 

 the pressure is transmitted by an india-rubber tube to T', the recording 

 tambour, the lever of which writes on a revolving drum. 



a tambour (T) which is connected by rubber tubing to another 

 tambour (T'), writing upon the drum. The muscle is stimulated (1) at 

 the point of application of the forceps, and (2) at some distance from 

 the forceps. The difference of time between the two resulting curves 

 is measured, and the rate of passage of the muscle wave calculated 

 therefrom. 



