3. Has the library a book with a certain title, the author’s name being unknown? 4. What has the library on a given subject? 5. What volumes of a certain series are in the library? 6. Where on the shelves of the library is a certain book to be found, if it is not in use by a reader? To answer these questions certain “entries”, or records, are made in the catalog, called the author, title, subject and series entries. Question 6, which is asked in connection with all the other questions, is answered by the call number, which appears on every entry. The most general book of reference is the dictionary. Every one is more or less familiar with its arrangement. This fact is the chief argument for a dictionary arrangement in a card catalog where authors, subjects, titles and cross references are arranged in one alphabet, as in a dictionary. Each “entry,” or record, is made on a card having on its first line the word, or words, under which the entry is made. This card is placed in its alphabetical place in the catalog tray. =Author Entry.=—Every book must have an author entry to answer questions 1 and 2. By author we mean the person, body, government, society or institution responsible for a work. The entry is usually made under the author’s surname, followed by his forenames. =Catalog Rules.=—Every good code of cataloging rules gives detailed directions for the author entry, telling how to decide who is the author and what form of his name to use. In order to gain the uniformity necessary for the easy consultation of the catalog, the cataloger must decide upon her rules and then follow them carefully. If this is done, the author card will ordinarily present few difficulties. The American Library Association rules (1908) are very full and offer the advantage of general conformity to the Library of Congress entries. The question as to fullness of author’s name may well be left to the individual library. The small library will need to use the author’s dates only to distinguish different authors of the same name. Many descriptive phrases may also be omitted, e. g. “pres. of the U. S.” in the heading, “Washington, George, pres. of the U. S.” and similar headings. This will in no way interfere with the use of the Library of Congress cards, in spite of their fuller entries, as the full and less full may easily be placed in one alphabet. All works of fiction, dramas and poems, and works of non-fiction having striking titles must have an additional record, or “added entry”, under the title, in order that the catalog may answer question 3. For this entry, the title is written at the top of the card. The average reader more frequently remembers the titles of books than the names of their authors. Consequently the cataloger must not be too sparing in making title entries.