82 



ANIMAL MECHANISM. 



fyiiig at its extremity the motions which it has received. 

 This lever, which ends in a point, traces on a turning cylinder 

 certain curves, which, when they are raised, indicate the con- 

 traction of the muscle, and when they are lowered, show 

 its return to its primitive length. 



With the arrangement which we have made in the myograph 

 a muscle may be operated upon without being detached from 

 the animal, which allows of the organ being left in the normal 

 conditions of its function. 



In Fig. 3 the frog is represented in the experiment, fixed, 

 by means of pins, on a piece of cork. 



Fig. 3. — Marey's Myograph. 



The brain and spinal marrow have been previously destroyed, 

 so ns to exticguish all voluntary movement and sensibility. 

 Although, to all appearance, the animal is dead, it will never- 



