452 PHYSIOLOGICAL EEGULATIONS 



Preservation of function, and restoration of it after distur- 

 bance, characterize most of the physiological quantities that have 

 been measured. Each equilibration appears as inevitable. No 

 estimate is attempted of the number of components whose preser- 

 vation (within certain limits of accuracies or stabilities) is requi- 

 site to the continued existence of any particular living unit. It is 

 plain that all components exist compatibly and recover after dis- 

 turbances in the midst of a community of regulations. 



