It has been suggested that the next edition of the list might be put into loose-leaf form, with a view to keeping it to date by inserting new leaves, when necessary, in place of old ones. Experiments may be tried along this line, and the relative merits of the various loose-leaf binders investigated. The advocate of this plan suggests that the Linotype slugs be kept standing, and that once a month the sheets on which changes have been made be reprinted, and distributed to the catalogers at the Library of Congress, and to subscribers to the list. The subject matter of a later list would doubtless agree with the present list in general features, but some minor changes might be found to be desirable. One point to which our attention has been called is the possible advantage of entering subjects in zoology and botany in the plural form rather than in the singular, as most of them have been entered in the present list. Another matter which merits consideration is the substitution of subdivided headings for the inverted forms now in use in certain classes of subjects, as in the headings Oxygen, Physiological effect of, and Man, Origin of. Some other questions to be considered are as to whether it would be advisable to distinguish in the list those subjects which are divided by country and then by city, from the subjects which have direct local subdivision; whether certain classes of headings now included could be advantageously dispensed with; and whether the main subdivisions of the animal and vegetable kingdoms are a valuable feature of the list. Doubtless other matters will suggest themselves for consideration as time goes on, and we shall hope eventually to publish a list which may commend itself as a valuable tool to library workers. Borrowing the words of Mr. Charles A. Cutter in the preface to his "Rules for a dictionary catalogue" we may say with him: "It is to be expected that a first attempt will be incomplete, and we shall be obliged to librarians for criticisms, objections, or new problems, with or without solutions." It had been hoped that Mr. J. C. M. Hanson would personally supplement this paper by an informal account of the early practice and experimentation of the Library of Congress. In his unavoidable absence, brief extracts from a personal letter were read by Miss Thompson, who then called upon DR. E. C. RICHARDSON, librarian of Princeton university, to open the discussion with some previously prepared notes on FUNDAMENTAL PRINCIPLES OF CATALOGING This discussion by the direction of proper authority is a discussion of the alphabetic subject catalog as suggested by the A. L. A. and Library of Congress subject heads. It is confined to general principles and general principles, of course, always have exceptions. This discussion is, however, free in considering these so far as it pleases.