Process of Power Changes 1 5 



A very common statement found in scientific 

 literature is to the effect that when a man works 

 hard for years he gets worn out, has his vitality 

 sapped, and falls into an early grave. The state- 

 ment is not at all true. The process of expend- 

 ing energy through bodily organs is one step in 

 the larger process of building up energy within 

 exercised organs. Instead of a man becoming 

 worn out and having his vitality sapped by hard 

 work, hard work is the thing that increases his 

 powers and vitality, and extends the length of his 

 life. 



How far can this be extended in man? That 

 we do not know as we do not have scientific rec- 

 ords bearing on the point, but by personal experi- 

 ment I have found that a man may add to his 

 physical strength by physical exercise after he 

 has past sixty years of age. But it is frequently 

 said that a man does not really build up physical 

 powers by physical exercise, and that all he does 

 is make manifest inherited powers within. At 

 this point we will go over to the trotting horse, 

 where we have records which we do not have for 

 man. 



