THE MUSCLES. 



of the shoulder. When traction is made with the left hand., 

 it exercises the muscles on the left side of the spine, while 



FIG. 11. 



those on the opposite side are left almost at rest, owing to 

 the oblique direction given to the shoulders when the right 



PIG. 12. 



hand grasps the horizontal cord. (This appliance will be 

 understood by referring to Fig. 13.) 



