To print or not to print? is a vital question for libraries, and it is in most cases decided to forego or to postpone printing, because of its great expense. Yet so manifest are the advantages of a printed catalogue, that all public libraries should make every effort to endow their readers with its benefits. These advantages are (1) Greater facility of reading titles. (2) Much more rapid turning from letter to letter of the catalogue alphabet. (3) Ability to consult it outside of the library. (4) Unlimited command of the catalogue by many readers at once, from the number of copies at hand, whereas card catalogues or manuscript volumes involve loss of time in waiting, or interfering with the researches of others. A part of these advantages may be realized by printing type-written copies of all titles in duplicate, or by carbon paper in manifold, thus furnishing the library with several copies of its catalogue: but why not extend this by multiplying copies through the ingenious processes now in use, by which the printing of titles can be effected far more cheaply than in any printing office? Might not every library become its own printer, thus saving it from the inconvenience and risk of sending its titles outside, or the great expense of copying them for the printer? The titles thus manifolded could be combined into volumes, by cutting away all superfluous margins and mounting the thin title-slips alphabetically on paper of uniform size, which, when bound, would be readily handled. All the titles of an author's works would be under the eye at a glance, instead of only one at a time, as in the card catalogue. And the titles of books on every subject would lie open, without slowly manipulating an infinite series of cards, one after another, to reveal them to the eye. The classification marks could be readily placed against each title, or even printed as a part of the manifold card titles. Not that the card catalogue system would be abolished: it would remain as the only complete catalogue of the library, always up to date, in a single alphabet. Daily accessions inserted in it would render it the standard of appeal as to all that the library contained, and it would thus supplement the printed catalogue. Of course, large and increasing accessions would require to be combined in occasional supplementary volumes of the catalogue; and in no long number of years the whole might be re-combined in a single alphabet, furnishing a printed dictionary catalogue up to its date.