12. In the case of journals and transactions brief abstracts of the contents of the several articles or papers to be drawn up and arranged in the alphabetical index under the heading of the article.
The advantage of this plan is that a précis can be made of the articles or papers which will be useful to the reader as containing an abstract of the contents, much of which might not be of sufficient importance to be sorted out in the alphabet; in the case where the entries are important they can be duplicated in the alphabet. A good specimen of this plan of indexing may be found in the indexes to the Journal of the Statistical Society.
13. Authorities quoted or referred to in a book, to be indexed under each author's name, the titles of his works being separately set out and the word "quoted" added in italics.
This rule is quite clear, and there is nothing to be added to it. It is evident that all books quoted should be indexed.
14. When the indexed page is large, or contains long lists of names, it is to be divided into four sections, referred to respectively as a, b, c, d; thus if a page contains 64 lines, 1-16 will be a, 17-32 b, 33-48 c, 49-64 d. If in double columns, the page is still to be divided into four—a and b forming the upper and lower halves of the first column, and c and d the upper and lower halves of the second column.
This division of the page will often be found very useful, and save much time to the consulter.
15. When a work is in more than one volume, the number of the volume is to be specified by small Roman numerals. In the case of long sets, such as the "Gentleman's Magazine," a special Arabic numeral for indicating the volume, distinct from the page numeral, may be employed with advantage.
The frequent use of high numbers in Roman capitals is very inconvenient.
16. Entries which refer to complete chapters or distinct papers, to be printed in small capitals or italics.
This is useful as indicating that the italic entry is of more importance than those in Roman type.