Produced by Audrey Longhurst, Laura Wisewell and the Online Distributed Proofreading Team at http://www.pgdp.net PREVENT LIFE-WASTE--UPBUILD NATIONAL VITALITY [Illustration: LIVE! THE LIFE EXTENSION INSTITUTE INC. NEW YORK. N. Y. 25 WEST 45th STREET] _Directors_ Hon. William H. Taft Henry H. Bowman Francis R. Cooley Robert W. de Forest Irving Fisher Eugene Lyman Fisk Harold A. Ley Elmer E. Rittenhouse Charles H. Sabin Frank A. Vanderlip HON. WILLIAM H. TAFT _Chairman, Board of Directors_ ELMER E. RITTENHOUSE _President_ GEN. W. C. GORGAS _Consultant, Sanitation_ PROF. IRVING FISHER _Chairman, Hygiene Reference Board_ EUGENE L. FISK, M.D. _Director of Hygiene_ HAROLD A. LEY _Vice-president and Treasurer_ JAMES D. LENNEHAN _Secretary_ The Institute was established by a group of scientists, publicists, and business men, who desired to provide a self-supporting central institution of national scope devoted to the science of disease prevention--a responsible and authoritative source from which the public might draw knowledge and inspiration in the great war of civilization against needless sickness and premature death. LIFE EXTENSION INSTITUTE, Inc. 25 WEST 45th STREET :: NEW YORK CITY HOW TO LIVE [Illustration: Hon. William Howard Taft Chairman, Board of Directors Life Extension Institute, Inc. COPYRIGHT MOFFETT STUDIO] HOW TO LIVE RULES FOR HEALTHFUL LIVING BASED ON MODERN SCIENCE _AUTHORIZED BY AND PREPARED IN COLLABORATION_ _WITH THE HYGIENE REFERENCE BOARD OF THE_ _LIFE EXTENSION INSTITUTE, INC._ BY IRVING FISHER, _Chairman_, PROFESSOR OF POLITICAL ECONOMY, YALE UNIVERSITY AND EUGENE LYMAN FISK, M.D., DIRECTOR OF HYGIENE OF THE INSTITUTE _NINTH EDITION_ FUNK & WAGNALLS COMPANY NEW YORK AND LONDON 1916 COPYRIGHT, 1915, BY FUNK & WAGNALLS COMPANY (Printed in the United States of America.) * * * * * _Published, October, 1915_ _Second Edition, November, 1915_ _Third Edition, December, 1915_ _Fourth Edition, March, 1916_ _Fifth Edition, April, 1916_ _Sixth Edition, May, 1916_ _Seventh Edition, June, 1916_ _Eighth Revised Edition, September, 1916_ _Ninth Edition, September, 1916_ FOREWORD