The question whether I am right in laying so much stress on the timely provision of space in libraries depends, as I have intimated, upon the more serious question, whether the library movement is to prove a success. If it is not, we need not trouble ourselves. If the present free libraries—at least those in populous towns and centres of intellect and industry—are not to be the nuclei of much more important institutions than they are at present; if they are not to become the pride of their respective districts, and to be supported by them upon a much more liberal scale than is now the case; if they are not to expect liberal accessions from the generosity of private donors; if they are not to be affiliated with whatever agencies exist around them for the promotion of culture; if, shedding from time to time what they may deem their obsolete books, they are to renounce all claim to an historical character, and only provide for those needs for which the circulating library exists already; then, indeed, the question of space need not concern us. But if the reverse of all this is to be the case; if they are to become noble libraries, store-houses of local and municipal as well as merely utilitarian literature; if all descriptions of English literature are to be at least fairly represented; if private collectors are to be made to see that the local library would afford a worthy repository for their books; then the question of space cannot be too attentively considered, or, in the height of success, the library may break down. You know the value of land in large towns, and the costliness of extending any premises that may be situated in a good quarter, and surrounded by shops, or warehouses, or public buildings. The possibilities of future extension should never be lost sight of when a site for a library is selected. But, as the most desirable site cannot always be had, it is still more important so to plan the library from the first that it may be susceptible of inner development, without trenching upon the adjoining land; and where, in the case of existing libraries, this precaution has been neglected, to lose no time in adapting the library for interior extension, if possible. At the Museum we have at present two methods—the sliding-press, whether suspended or resting on the ground, and the pivot-press. Both these have been described to you. But they by no means exhaust the possibilities of economising space, and I wish to draw your attention to other ingenious methods, which, however, I am not about to describe, for I take this to be the proper business of the inventor. That they must be worth attention you will all agree, when I tell you they are devised by Mr. Virgo. Mr. Virgo, as his name seems to imply, is a gentleman of singular modesty. I do not think that, but for me, he would ever have received the credit due to him for his share in the invention of the sliding-press; nor do I think that he has done nearly enough to bring his ingenious ideas forward for the general good. I hope he will do so, either at this meeting, or ere long in the pages of THE LIBRARY, or some other suitable medium. I shall not attempt to trespass upon his ground, but will very briefly make a suggestion for book accommodation in a restricted space, which his ingenious contrivances may have prompted, although to find its exact prototype we must go back to the earliest libraries that have ever existed.