146 PHYSIOLOGY OF MICROORGANISMS 



study is attempted in an elementary manner it consists in recognizing 

 observational functions without attempting to explain or understand 

 the mechanism frehind. Such attempts belong to the first steps in 

 primary and secondary education. The limitations or boundaries of 

 physiological knowledge are those established by the human mind in 

 laying hold of and utilizing the nature and the facts of the elemental 

 studies upon which physiology rests and its ability to translate them in 

 the life-mechanism at work. 



