Biology A lecture delivered at Columbia University in the series on Science, Philosophy and Art November 20, 1907

Huxley and education Address at the Opening of the College Year, Columbia University, September 28, 1910

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

Spencer's Philosophy of Science The Herbert Spencer Lecture Delivered at the Museum 7 November, 1913

Critical and Historical Essays Lectures delivered at Columbia University

The History of University Education in Maryland The Johns Hopkins University (1876-1891). With supplementary notes on university extension and the university of the future