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 “Franks” all articles relating to the Frankish Empire up to the period when it lost its unity, and with these the article “Charlemagne” was naturally included. Similarly the article “Electricity Supply” might have been placed in any one or all of the sections Engineering, Industries and Commerce, Law, Sociology. It was felt, however, that its proper place was beside the other articles which appear in the subsection Electricity under the general heading Physics.

Readers should note in connexion with the question of duplication that the sections entitled History and Geography are mutually complementary. The vast majority of articles under topographical headings contain the historical information appropriate to the county, district or town which they describe. Similarly the sections Archaeology and Anthropology are inter- dependent, referring respectively to the ancient and the modern divisions of the same science. As regards Archaeology all the articles on the sites will be found under Geography, while the articles under Anthropology must be supplemented by those in the section Religion § Comparative.

It should further be understood that this classification does not claim to exhaust the articles in the Encyclopaedia, but rather to collect under the obvious headings, main and subsidiary. those articles which are necessary to the understanding of a given subject.

Further guidance as to the arrangement of the sections is given on pp. 881-882.

THE EDITORS. , May 31, 1911.