The psychology of number and its applications to methods of teaching arithmetic / by James A. McLellan, A. M., LL. D. principal of the Ontario School of Pedagogy, Toronto and John Dewey, PH. D. head professor of philosophy in the University of Chicago - McLellan, James Alexander, 1832-1907 (International Education Series edited by William T. Harris, A. M., LL. D. Volume XXXIII)