12 THE PRINCIPLES OF MYODYNAMICS. 



B. If the power exactly equals the weight, it 

 can not move the weight ; but if the power is 

 greater than the weight, the weight moves, be- 

 cause it can not entirely resist the power : 

 Hence, in myokinetics the force of the muscles 

 is greater than in myostatics. 



4. For the sake of convenience we have 

 three orders of the Lever : 



(i.) In the first order the fulcrum is in the 

 continuity of the lever. 



(2.) In the second order the weight is in the 

 continuity of the lever. 



(3.) In the third order the power is in the 

 continuity of the lever. 



5. The principles of the lever are illustrated 

 in Fig. I. 



(i.) The circles representing the forces at the 

 ends of the lever are seen together in the con- 

 tinuity of the lever. 



(2.) The three orders of the lever may be re- 

 membered by the relations of the letters F. W. 

 P. as they are located in the continuity of the 

 lever : F. in I; W. in II; P. in III order. 



(3.) The equilibrium of the forces at the ends 



