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subject-matter of copyright should include, in the nature of things, those products of invention, creations of the human brain, which are realized and utilized immaterially through material records, and not, as in the case of patents, materially through the material itself. Copyrightable works, in brief, are those which appeal from the imagination to the imagination, or in which intellectual labor combines immaterial product into new form. What may be copyrighted specifically and. practically depends, under present conditions of law, upon the statutory provisions, national or international, of the several nations of the world.

The new American code gives the following classification of copyrightable works:

"(Sec. 5.) That the application for registration shall specify to which of the following classes the work in which copyright is claimed belongs:

"(a) Books, including composite and cyclopaedic works, directories, gazetteers, and other compilations;

"(b) Periodicals, including newspapers;

"(c) Lectures, sermons, addresses, prepared for oral delivery;

"(d) Dramatic or dramatico-musical compositions;

"(e) Musical compositions;

"(f) Maps;

"(g) Works of art; models or designs for works of art;