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 Rh instruments; puzzles; games; rebuses; labels; wrappers; formulae on boxes, bottles, and other receptacles of articles for sale or meant to accompany such articles.

Advertisements or catalogues which merely set forth the names, prices, and places where articles are for sale.

Prefaces or other introductory matter to works not themselves entitled to copyright protection, such as blank books.

Calendars are not capable of registration as such, but if they contain copyrightable reading matter or pictures they may be registered either as "books" or as "prints" according to the nature of the copyrightable matter.

6. (b) Periodicals.— This term includes newspapers, Periodicals magazines, reviews, and serial publications appearing oftener than once a year; bulletins or proceedings of societies, etc., which appear regularly at intervals of less than a year; and, generally, periodical publications which would be registered as second-class matter at the post-office.

7. (c) Lectures, sermons, addresses, or similar productions, prepared for oral delivery. etc.

8. (d) Dramatic and dramatico-musical compositions. such as dramas, comedies, operas, operettas and similar works.

The designation "dramatic composition" does not include the following: Dances, ballets, or other choregraphic works; tableaux and moving picture shows; stage settings or mechanical devices by which dramatic effects are produced, or "stage business"; animal shows, sleight-of-hand performances, acrobatic or circus tricks of any kind; descriptions of moving pictures or of settings for the production of moving pictures. (These, however, when printed and published, are registrable as "books.")

9. Dramatico-musical compositions include principally operas, operettas, and musical comedies, or similar productions which are to be acted as well as sung.

Ordinary songs, even when intended to be sung from the stage in a dramatic manner, or separately published songs from operas and operettas, should be registered as musical compositions, not dramatico-musical compositions.