26. In the case of rare books a collation should be added to the title slip; but all books, when only in one volume, should have the number of their pages added. [178]
Abstracts of Contents.
27. When the contents of a set of works are very varied, a short abstract of the contents of each volume may be added with advantage. When the contents are of a similar character, like a collection of plays, it will be more convenient to throw the titles into alphabetical order, and add the number of the volume to each entry. [206]
References.
28. All references should be in English, and the subject of a book must be referenced, even if it is not clearly expressed on the title-page. [187]
29. When a book contains something which is not mentioned on the title-page, it must be added either between brackets or in a note, and then a reference can be made to it; but no reference must be made to a title which does not contain the information required. [187]
30. References in an alphabetical catalogue should not be classified. Thus Gold should be under G, and Silver under S, instead of being grouped under Metals. Cross-references may be given from Metals to Gold and Silver. [188]
31. It is not necessary to follow the exact wording of a title in the reference but it will be often more convenient for the cataloguer to make a heading which may include several references. [187]
Arrangement.
32. Before arranging the entries of a catalogue it will be necessary to decide whether all the books are to be included in one alphabet; and if not, what are to be excluded. [209]