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Editors of the American Journal of Diseases of Children believe that pertinent letters-to-the-editor regarding papers published in its pages are not only of interest to subscribers, but also often scientifically valuable in expanding knowledge or in delineating areas of legitimate controversy. To appear as a printed page, these letters must pass through the hands of editors, printers, and other technical personnel. It is, therefore, requested that those who write these letters follow the same general rules as apply in the submission of manuscripts. The typing should be double- or triple-spaced with margins ample for editorial notations.