This booklet, prepared under the chairmanship of Edward R. Schlesinger, M.D., Director of the Bureau, with the assistance of a group of specialized workers, has been reviewed in detail by the Advisory Committee on Rheumatic Fever in the New York State Department of Health, Composition of this Committee includes for the most part important members of the American Heart Association and the booklet has been approved as a guide by the American Council on Rheumatic Fever.