Missing page 6, and 23. Thesis (Ph.D.)--Boston University. / Initial acquaintance with the philosophies of C. J. Ducasse and J. B. Pratt gives one the impression that the two philosophers are closely akin. This impression, doubtless, stems from the fact that both authors are prominent Realists, outspoken Dualists, and widely recognized writers on religion. The purpose of this dissertation is to inquire into the very workings of these two ostensibly similar philosophical positions, to ascertain whether or not Ducasse and Pratt actually are in fundamental harmony, and to determine the basis for any essential difference which a comparative analysis might show to exist between selected views of the two authors. Within the context of this investigation, the author also intends, as a kind of secondary endeavour, to criticize and assess the general philosophical positions under scrutiny. [TRUNCATED]