This manual had its origin in World War II and the fourth edition now appears to meet a similar need of American troops operating in a tropical region. Its usefulness is far broader. American medicine now reaches into developing countries through programs of international aid, long-term prospective field research, and Peace Corps activities. Many countries in their newly acquired independence take on a direct responsibility. The book serves well as a teaching medium; it retains its greatest value as a field manual with much information in compact form. Infectious diseases, nutritional disorders, and a brief concern of the tropical environment are the basic features. Parasitology, along with related subjects of arthropod vectors, pesticides and medically important animals, forms about one-half of the text. Chapters on viral diseases are rewritten. The great quarantinable diseases have full consideration, notably cholera and its recently active El Tor variant. New features are dengue fever and the allied hemorrhagic fevers, and kuru. The work is in the Manson tradition, up to date and authoritative with its 37 contributors. Tropical medicine however is no longer restricted to a hard core of military officers, medical missionaries, and colonial administrators. A variety of amateurs, medical beginners and nonmedical workers, need knowledge of the everyday features of disease in the tropics. Measles, whooping cough, and the other common communicable diseases of childhood are not included, despite their significance as causes of death and their clinical individuality in tropical regions. Future editions might well extend consideration of the tropical environment beyond the risks inherent in heat and humidity: to ways of life, water supply, the social and economic determinants of ill health; in a wvord, to the specific features of a tropical preventive medicine. With their broad experience, the authors are admirably suited to this larger demand. JOHN GORDON
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