This book is a result of three lectures, which were delivered in the Hall of Gray's Inn, London, on June 13, 15, and 19, 1922, respectively, under the auspices and on the invitation of the University of London. The invitation originated with the University of Manchester, which, through its then Vice-Chancellor, Dr. Ramsay Muir, two years ago graciously invited me to visit Manchester and explain American political institutions to the undergraduates. Subsequently I was greatly honoured when the Universities of Cambridge, Edinburgh and London joined in the invitation.