ACKNOWLEDGMENTS 



This paper was presented to the Division of Philosophy of 

 Columbia University as a doctoral dissertation. It was written 

 under the direction of Professor John Angus MacVannel, of 

 Teachers College, to whom is made grateful acknowledgment 

 of kind encouragement and valued suggestions. The writer 

 welcomes the opportunity of expressing his sense of an indebt- 

 edness of a fundamental character to the teachings and gen- 

 erosity of Professor John Dewey. Thanks are due also to 

 Professor J. Perrin Smith, of the Department of Geology in 

 Stanford Unversity, for his courtesy in reading the manuscript. 



P. E. D. 



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