490 



PAUL S. HENSHAW 



Maximum Effectiveness 



o 



w 



> 



t— I 



H 



Oh 



Q 

 < 



Wellness range 



(Reserve adaptiveness) 



Normal, or usual range 



Absence of disease 



Sickness range 



(Required adaptiveness] 



Failure, including death 



Fig. 1. Scale of fitness. 



