By nature man is endowed with resistive power sufficient to ward off most forms of disease, provided he keeps his health at a normal standard by right living. If, however, he allows his health to become impaired by reason of overwork, bad habits, wilful exposure to contagion or unhealthful surroundings, he readily falls a prey to disease. The author of _Principles of Public Health_ has here set forth the general rules of life by the observance of which every adult and every child not only can do much to preserve his own health but also can prove himself a prominent factor in raising the standard of public health. A campaign of education is demanded to arrest the enormous loss of life which is carrying so many to untimely graves, and the instruction given in this volume will be of inestimable value in teaching people how to avoid avoidable disease. The author has not attempted to deal with all the diseases that may be classed as preventable; as the work is intended for use in the public schools, only such diseases are mentioned as it seems fitting to present to school children. To teach our children a proper respect for their own health and for the community welfare is to fit them for the best citizenship. E. A. PIERCE, M. D. PORTLAND, OREGON ACKNOWLEDGMENTS The author wishes to express his sincere appreciation of the valuable assistance rendered in the preparation of this work by Dr. S. T. Armstrong, of New York City; Dr. H. Wheeler Bond, Commissioner of Health, St. Louis, Missouri; Dr. H. M. Bracken, Secretary and Executive Officer of the State Board of Health of Minnesota; J. S. Caldwell, Professor of Biology, George Peabody College for Teachers, Nashville, Tennessee; R. J. Condon, Superintendent of Schools, Providence, Rhode Island; Mrs. Nona B. Eddy, of the Public Schools of Helena, Montana; Dr. F. M. McMurray, of Teachers College, Columbia University, New York City; Miss Jessie B. Montgomery, Supervising Critic in Training School, State Normal School, Terre Haute, Indiana; Dr. E. A. Pierce, Secretary and Executive Officer of the State Board of Health of Oregon. CONTENTS PART I--THE FIGHT FOR HEALTH CHAPTER PAGE I. CONSTANT DANGER OF ILLNESS 1 II. THE NECESSITY OF CARING FOR THE BODY 4 III. HOW CLOTHING AFFECTS HEALTH 9 IV. THE USES OF FOOD 14 V. CARE OF FOOD--MEATS 18 VI. CARE OF FOOD--MILK 22 VII. DECOMPOSITION OF FOOD 30 VIII. HARM DONE BY IMPROPER COOKING 34 IX. HOW NEATNESS, CHEERFULNESS, AND GOOD MANNERS PROMOTE HEALTH 37 X. DANGERS FROM POOR TEETH 41