Logic as the Science of the Pure Concept

Prolegomena to the Study of Hegel's Philosophy, and Especially of His Logic

Reformed Logic A System Based on Berkeley's Philosophy with an Entirely New Method of Dialectic

Philosophy in Sport Made Science in Earnest Being an Attempt to Illustrate the First Principles of Natural Philosophy by the Aid of Popular Toys and Sports

Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives Dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Faculty of Pure Science of Columbia University

The Positive Outcome of Philosophy The Nature of Human Brain Work. Letters on Logic.