Contents: The following lectures were delivered before the students of the Graduate School in February and March 1930, and are issued in this form for present and former students of the school. Scientific Method in Economic Research -- by Dr. E. B. Wilson, President, Social Science Research Council; Evaluating Institutions as a Factor in Economic Change -- by Prof. John R. Commons, University of Wisconsin; Fact and Interpretation in Economics -- by Dr. F. H. Knight, University of Chicago; Analytical Methods in Agricultural Economics Research -- by Dr. John D. Black, Harvard University.