[45] It also belongs to the class Portraits, but that is in the Form-catalogue, not the Subject-catalogue.
110. If a book purports to treat of several subjects, which together make the whole or a great part of one more general, it may be put either under each of the special subjects, or under the general subject, and in the latter case it may or may not have analytical references from the specific subjects, according as the treatises are more or less distinct and more or less important.
E. g., “A treatise on anatomy, physiology, pathology, and therapeutics,” which might be put under each of those four headings, ought rather to be entered under Medicine, in which case, if the separate parts are by different authors, analyticals might very well be made under the four headings; and at any rate an analytical under the first would occasionally be useful as equivalent to a subject-word reference.
111. When a considerable number of books might all be entered under the same two or more headings, entry under one will be sufficient, with a reference from the others.
On the other hand, if in printing it were noticed that under any subject only one or two titles were covered by the cross-references to countries (as from Sculpture to Greece, Italy, Denmark), it may be thought that double entry under nation and subject would be preferable. A man is provoked if he turns to another part of the catalogue to find there only one title. However, it should be remembered that one or two titles repeated under each of many subjects will amount to a considerable number in the whole. The want of uniformity produced by this mixture of reference and double entry is of less importance.
112. When there are many editions of a book, it is allowable to merely refer under the subject to the author-entry. In a college library, for instance, the full entry of all the editions of the classics under their appropriate subjects (as of the Georgics under Agriculture, of Thucydides under Greek history, and Polybius under Roman history) would be a waste of room; it is enough to mention the best edition and refer for other editions and translations to the author’s name.
(l.) Miscellaneous rules and examples.
113. Trials relating to a vessel should be put under its name; Short would make no other entry. Exploring expeditious or voyages in a named vessel should have at least a reference from the name.
Ex.
Jeune Eugénie. MASON, W. P. Report. Boston, 1822. 8º.