This publication has enjoyed second-class mailing privileges since December 10, 1946. 58- Memorandum Decision, December 30, 1959. It was agreed that the publication met all the other requirements for the use of the second-class mailing privilege. 39 U. S. Code, Sec. Medicine is a science.
Ophthalmology is a particular field in medicine.
Since the Congress of the United States has never spelled out what a periodical is, one must rely upon the interpretation of the statute by the cases. Ordinarily each number is incomplete in itself, and indicates a relation with prior or subsequent numbers of the same series. It implies a continuity of literary character, a connection between the different numbers of the series in the nature of the articles appearing in them, whether they be successive chapters of the same story or novel or essays upon subjects pertaining to general literature. If, for instance, one number were devoted to law, another to medicine, another to religion, another to music, another to painting, etc., the publication could not be considered as a periodical, as there is no connection between the subjects and no literary continuity. It could scarcely be supposed that ordinary readers would subscribe to a publication devoted to such an extensive range of subjects.