The twelfth volume of the Practitioners Library of Medicine and Surgery is a sound, composite textbook on preventive medicine and hygiene. Such a book is of the greatest importance in rural medical practice. After a discussion of periodic physical examination there are special chapters dealing with water, clothing, exercise and rest, excretions, sunshine, cleanliness and personal mental hygiene. The second portion of the book concerns preventive medicine as it applies to groups of human beings; the third section deals with community health; the fourth section covers the prevention of infectious diseases, as well as the diseases of the various systems of the human body. All the men selected to prepare various portions of this book are writers who have had special training and interest in the topics they discuss. The book is practical, authoritative and obviously a fundamental addition to this system of medicine and surgery.