PREFACE 15 



higher spaces of my thought will be inspired to blaze 

 the trail for themselves if they will read Mr. Claude 

 Bragdon's " Four-Dimensional Vistas " the clas- 

 sic of Hyper-Space; and should any question the 

 wisdom of such venturing into the cold and awesome 

 regions of mathematics, I recommend for their logical 

 consideration a new and epoch-making book by Pro- 

 fessor C. J. Keyser, " The Human Worth of Rig- 

 orous Thinking. " 



In closing, I would add that it is not the purpose 

 of my book, as the title might imply, to advance a 

 criticism of Mr. Bergson's philosophy, but rather to 

 build on his thought constructively for the greater 

 evolution to come. 



CORA LENORE WILLIAMS. 



