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 periodicals whose names are mentioned or otherwise known. We will proceed to notice a few of the more striking features of the system.

WORKS BY SINGLE AUTHORS

(i) If a writer's name become changed, the later form is taken. Thus the Orientalist Boetticher, who came in for some property and changed his name to Lagarde, appears under the latter form. The Museum heading chronicles his rise to greatness by the form Boetticher afterwards Lagarde.

(2) When the name of an author writing under a pseudonym becomes revealed, that becomes the heading, and the pseudonym appears as a cross-reference only.

(3) "Descriptions" of an author cannot form headings. Thus a book stated on its title-page to be "von einem Juristen" is treated as anonymous.

When several authors are named on the title-page (i) Collections of different works, having a collective title, take their heading from this title (in accordance with the rules for anonymous books), and cross-references are made from each part, if "bibliographically independent." If the parts are not of this kind, as e,g, in an encyclopaedia, the general editors, if there are any, have cross-references, but none of the authors ; if there are no general editors, then the first and last of the authors named on the title-page have cross-references.