This text traces the further development and emergence of American philosophy, particularly Naturalism and Pragmatism, against the backdrop of still-dominant Hegelian philosophy, during the third decade of the 20th century, through the addresses and biographies of the presidents of its oldest and largest philosophical society. Of special interest is the previously unpublished presidential address of Henry Walgrave Stewart, second president of the Pacific Division of The American Philosophical Association. The work contains the biographies, photographs, and addresses of 24 past presidents, and photographs and addresses of two others whose biographies appeared in earlier volumes.