1 6 THE PRINCIPLES OF MYODYNAMICS. 



While the weight appears to manifest more 

 energy than the power, it must be kept in mind 

 that, in so far as myostatics is concerned, the 

 power must be greater than the weight, in order 

 to be able to move the weight : and as the 

 weight moves, it accumulates energy from the 

 power. Hence the weight, in the case supposed, 

 manifests the energy it has obtained from the 

 power of the contracting muscle. Hence, it 

 must follow, that the energy gained by the weight 

 under the circumstances must equal the energy 

 expended by the contracting muscles — and that 



IN EFFECT THE WORK DONE BY THE WEIGHT MUST 

 EQUAL THE WORK DONE BY THE POWER. 



7. The principle of the parallelogram of forces 

 may be illustrated by Fig. 2. 



(i.) As we shall resolve the forces of muscles 

 into rectangular components Fig. 2, is made a 

 rectangle. 



(2.) In myostatics the force of the muscle 

 is resolved into the rectangular components a 

 and b. 



(3.) In inyokinetics the force of the contract- 

 ing muscle may be resolved into the rectangular 



