The 18th edition of Manson's Tropical Diseases has recently been published. Since Sir Patrick Manson first published his book Tropical Diseases in 1898, this textbook has served as the standard tropical medicine reference in many areas throughout the world. The expressed purpose of the 18th edition, now written in part by P. E. C. Manson-Bahr, is to provide a general reference text for practitioners, as well as students, and the book remains the best available for clinical aspects of the practice of medicine in the tropics. The text is well illustrated with many photomicrographs provided by The Wellcome Museum of Medical Science. Several major chapters of the book are specially written by experts in the particular area. For example, the presentation of hemoglobinopathies as part of anemia in the tropics, by Dr David Weatherall, is clear, concise, and comprehensive. Similarly, the discussion of ophthalmologic problems in the tropics is excellent.