Four Lectures on Mathematics, by Jacques Hadamard 29788 [Subtitle: Delivered at Columbia University in 1911] [Link: http://www.gutenberg.org/2/9/7/8/29788 ] [Files: 29788-t.tex; 29788-pdf.pdf] Thanks to Andrew D. Hwang, Brenda Lewis and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images from the Cornell University Library: Historical Mathematics Monographs collection.) David