Infectious Diseases, by W. Edmund Farrar and Harold P. Lambert ( Pocket Picture Guides to Clinical Medicine ), 82+ pp, 164 illus, $11.95, Baltimore, Williams & Wilkins Co, 1984. The publisher of this series of compact books states that the Picture Guides' purpose is "to provide essential visual information about commonly encountered diseases in a convenient, practical and economical format." These two examples from this series fulfill that purpose. Each provides excellent color photographs showing classic clinical appearances of disease. The quality of reproductions is generally superb; concise textual material accompanying each picture highlights diagnostic features. Bingham's work nicely organizes material into four categories: major causes of urethral discharge, vaginal discharge, genital ulceration, and miscellaneous sexually transmitted conditions, eg, warts, scabies, and pediculosis. Farrar and Lambert offer the reader a sampler of more than 160 photographs from their larger, encyclopedic work wth 722 illustrations, entitled Infectious Diseases Illustrated . Naturally, in a pocket-sized