In the following pages I should like critically to consider certain aspects of John Dewey's thought as set forth for the most part in Experience and Nature. In particular, I should like to discuss the conceptions of being and of philosophieal reflection which underlie his delineation of human agency as located in nature and as essentially characterized by reference to the problematic. I select these ideas both because they concern something fundamental philosophieally and because one can see in Dewey's development of them both the strength and weakness of his philosophieal reflection.