First let us take up the status of our stock in trade--our supply of books. President Eliot warned us two years ago that our books are piling up too fast. His warning has met with scant heed because experience has not brought it home to most of us. Malthus warned us long ago that the progress of population was toward overcrowding the world. We laugh at him because there is still plenty of room and means of utilizing it unknown in his time. Yet population increases, and it will overcrowd the world some day unless something occurs to prevent. In like manner our stock of books increases faster and faster. The ordinary American public library is a thing of yesterday; small wonder that it does not yet begin to feel plethoric. Our oldest large libraries are those of our universities, and Harvard’s president has told us that to them the evil day is within sight. Librarians have not received with favor President Eliot’s plea for getting us out of our future difficulty but this is neither here nor there. To judge by our present attitude either our library buildings must increase indefinitely in size or our stock must be weeded out. It must be remembered, however, that our books are perishable, and are growing more so. I do not regard this as an unmixed evil. Rather than to make our books unwieldy for the purpose of preserving them we prefer to make them usable and to rely on reprinting for their perpetuation. Thus what is not wanted will pass away. Perhaps this will solve our problem for us. But in any case it looks as if the future library building and its contents were to be greatly larger than those of to-day. What are to be the style and arrangement of the future library building? The present situation can hardly be described in general terms. As in all building operations, there is a strife between the architect, representing aesthetics, and the administrator, representing utility. At present the architect seems to be having his way outside and the librarian his way inside. But why this contest? Is it not the architect’s business to make utility more beautiful but not less useful? And should not the administrator wish his surroundings to please the eye? Apparently the two are drawing a little closer together of late. We are having fewer temples of art that have to be made over to fit them for use as libraries and fewer buildings that are workable but offensive to the eye. The tendency seems to be toward simple dignity, although we certainly have some surprising departures from it. Probably the library of the future will be a simple and massive structure of much greater size than at present, with its decorations largely structural, and combining ample open-shelf and reading facilities with greatly increased capacity for book-storage.