[Illustration: Dr. S. Adolphus Knopf] [Illustration: Dr. J. N. Hurty] [Illustration: Chancellor David Starr Jordan] [Illustration: Prof. M. E. Jaffa] [Illustration: Mr. Calvin W. Hendrick] [Illustration: Mr. William J. Harris] [Illustration: Hon. Walter H. Page] [Illustration: Dr. Geo. M. Kober] [Illustration: Dr. J. N. McCormack] [Illustration: Prof. Lafayette B. Mendel] [Illustration: Dr. W. S. Rankin] [Illustration: Mr. Edward Bunnell Phelps] [Illustration: Prof. R. Tait McKenzie] [Illustration: Dr. Dudley A. Sargent] [Illustration: Dr. M. J. Rosenau] [Illustration: Prof. Leo. F. Rettger] [Illustration: Mr. Wickliffe Rose] [Illustration: Dr. Theodore B. Sachs] [Illustration: Dr. Edward A. Rumely] [Illustration: Prof. Mazyck P. Ravenel] [Illustration: Dr. J. W. Schereschewsky] [Illustration: Dr. Wm. Jay Schieffelin] [Illustration: Dr. Elmer E. Southard] [Illustration: Prof. Alonzo A. Stagg] [Illustration: Major Louis L. Seaman] [Illustration: Dr. W. F. Snow] [Illustration: Prof. A. E. Taylor] [Illustration: Dr. Chas. W. Stiles] [Illustration: Dr. Victor C. Vaughan] [Illustration: Dr. Thomas A. Storey] [Illustration: Prof. George C. Whipple] [Illustration: Dr. William H. Tolman] [Illustration: Prof. Walter E. Willcox] [Illustration: Dr. Henry Smith Williams] [Illustration: Dr. Cressy L. Wilbur] [Illustration: Prof. C. E. A. Winslow] [Illustration: Dr. Hugh Young] [Illustration: Dr. Harvey W. Wiley] HOW TO LIVE INTRODUCTION The purpose of the Life Extension Institute embraces the extension of human life, not only as to length, but also, if we may so express it, as to breadth and depth. It endeavors to accomplish this purpose in many ways, but especially through individual hygiene. Thoroughly carried out, individual hygiene implies high ideals of health, strength, endurance, symmetry, and beauty; it enormously increases our capacity to work, to be happy, and to be useful; it develops, not only the body, but the mind and the heart; it ennobles the man as a whole. [Sidenote: Medieval Ideals] We in America inherit, through centuries of European tradition, the medieval indifference to the human body, often amounting to contempt. This attitude was a natural outgrowth of the theological doctrine that the "flesh is in league with the devil" and so is the enemy of the soul. In the Middle Ages saintliness was often associated with sickliness. Artists, in portraying saints, often chose as their models pale and emaciated consumptives. We are beginning to cut loose from this false tradition and are working toward the establishment of more wholesome ideals. It is probably true, for instance, that the man or the woman who is unhealthy is now handicapped in opportunities for marriage, which may be considered an index to the ideals of society. [Sidenote: The Present Health Movement]