CHAPTER V 



CONCLUSION 



IN the foregoing chapters I have relied chiefly 

 on my own observations and results, but owing 

 to the absence of material I have in some cases 

 been obliged to rely on and to quote other men's 

 work and opinions. I have tried to use only 

 what seems to be established or to be reasonably 

 probable. This last chapter I look on as my own 

 in a large measure. The observations are my own 

 and the speculations also ; the results seem to 

 me absolutely trustworthy and to be full of hope. 



There is enormous and quite unnecessary 

 wastage of work and energy at the back end of lif e. 

 Men and women, who have worked faithfully 

 and well, and who have laid up a store of know- 

 ledge and wisdom, suddenly break down with 

 paralysis, heart trouble, or premature senile decay. 

 Even if they survive for a time, most of their 

 life's fruit is no longer available. 



Let us get this axiom (for it almost deserves 



the name) into our minds, that senile decay is 



endocrine failure ; it may pass rapidly into 



endocrine decay, but there is a time, a day of 



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