HARVARD COLLEGE 47*78 COPYRIGHT, 1919, BY JOHN LIVINGSTON LOWES Lit 1477.19 ALL RIGHTS RESERVED A PREFACE THE chapters which constitute this volume were delivered as lectures at the Lowell Institute in Boston during January, 1918. Except for some slight shifts in the order of treatment in the fourth chapter, they are printed as they were given. The last lecture, in part, grew out of what was then the one dominating and unescapable influence on all our thinking. It has been allowed to stand, as the apologia pro vita sua of such a book at such a time. January, 1919. J. L. L. |