=Subject Entries.=—Non-fiction must also have added entry under the subject or subjects of the book. It is here that the cataloger finds scope for all her knowledge, judgment and common sense. Above all, let it not be said of her that she “Affects all books of past and present ages, But reads no further than their title-pages.” She must examine the books carefully, studying the table of contents, preface, analyses of chapters when given, marginal notes, and the chapters themselves when necessary. No entry is to be made under any subject unless the cataloger is sure that the book contains material helpful to one looking up that subject. She must always try to put herself in the reader’s place, and get his point of view. The cataloger is extremely liable to worship rules and to forget the limitations of the average reader. There is danger of taking too much for granted. In this respect the cataloger is like a certain professor who was given to quoting Arabic in his popular lectures. When some one, remonstrated, he said, “Oh, everybody knows a little Arabic.” The cataloger must bear in mind the fact that many users of the library do not know how to look up book titles. President Eliot once confessed to a body of librarians that although he might claim to be as intelligent as the ordinary frequenter of a library, he did not know enough to use a card catalog. =Cutter’s Rules.=—Having decided what the subject or subjects of the book may be, for it may have one or many, the question arises as to the form of the subject headings to be used. C. A. Cutter, in his “Rules for a dictionary catalog” (4th edition, =1904=) has laid down the principles of the choice of subject headings. One of the most useful tools of the cataloger is the American Library Association “List of subject headings” (3d edition, 1911), the result of widespread consultation and discussion on principles and practice. Here is gathered the experience of many libraries, of all types, and the cataloger would do well to follow this list unless experience has shown her that in some cases her special library requires a variation. The suggested cross references are a great help, but must be used with care and judgment. The cross references are the sign posts in the wilderness of the catalog, and they must point the way clearly and with truth. The cataloger never knows at just what point the reader will strike the catalog, but if the subject headings and cross references have been judiciously chosen he is pretty sure to reach the desired goal.