BIOLOGICAL CONTROL 



ground for repose, happiness and satisfac- 

 tion in achievement. 



From these reflections it is clear that 

 control of behavior from within the or- 

 ganization is a fundamental vital property 

 common to all organisms from the lowest 

 to the highest. In the lower ranks of life 

 this control can readily be seen to be me- 

 chanically determined in accordance with 

 physiological laws, some of which are well 

 established experimentally. Causal se- 

 quences can be followed through in these 

 processes, from the incorporation by the 

 organism of external materials and ener- 

 gies to the return to the environment of 

 the material and equivalent amounts of 

 energy as muscular movement, heat, etc. 

 This physiological control is real and eas- 

 ily demonstrated by ordinary laboratory 

 methods. 



Of course, this is only a partial state- 

 ment of the apparatus of biological con- 

 trol. All hving is interaction between a 

 protoplasmic organization and the ener- 

 gies of an appropriate environment. One 

 may analyze and evaluate the vital proc- 

 esses from the standpoint of either the 

 internal or external factors. We are con- 

 cerned here only with the former. The 



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