Chap, xvi i.] THE PEND UL UM MYOGRA PHION. 1 8 1 



down the liberated pendulum swings back ; but by the 

 momentum it acquires it passes the middle line, and 

 swings up on the other side, where it can be caught by 



Fig. 89. Pendulum Myographiou. 



another catch precisely similar to 5. When the pen- 

 dulum swings the glass plate is drawn in front of a 

 steel point projecting from a heavy lever, which is sup- 

 ported by a frog's gastrocnemius held in the forceps. 

 The nerve of the muscle is laid across electrodes of 

 platinum wire, similar to those shown in Fig. 45, on 

 page 83, so as to permit the nerve being stimulated 



