We must establish a central committee or committees to take charge of such titles, to cancel the innumerable duplicates, to reduce the others to approximate conformity with the rules on which the basis catalogue has been executed. We must have learned to what extent pecuniary assistance to small or over-worked libraries may be necessary, and have considered how to provide it. We must have determined whether the General Catalogue is to embrace that of the Museum or to be merely supplementary, and in either case have framed some estimate of the probable expense, and of the means of meeting it. We must have decided some important questions, as, for instance, whether pamphlets, newspapers, public documents, should be included, whether oriental books, to what extent cross-references should be allowed, if admitted at all. These points and many others cannot be settled without active intercommunication among librarians, and when I consider the attendant difficulties I own I am not sanguine that the project will have matured by the time that the Museum Catalogue is in print. When, however, the difficulties of organisation have been at length overcome, when the Museum Catalogue is actually in the hands of the directors of all important libraries, and the task of supplying its deficiencies is being steadily prosecuted in a hundred different places; when the editorial committee is fairly engaged upon its task of revision and incorporation, and public sympathy has been fully enlisted, as would ere long assuredly be the case, the record of the world's literature which now may seem to many an utopian project, will have been brought within reach. In thus carrying it out we should have effected an object of still greater importance—the establishment of an universal literary registry, whose developments and ramifications it is impossible to predict. Such an institution is hardly likely to come into being without the tangible inducement of an Universal Catalogue; and it is on this account, quite as much as its own, that an Universal Catalogue is desirable. The organisation created to effect it would not be allowed to perish, but would be maintained for objects more important still. All these possibilities, however, will remain but visions unless they are based upon the firm ground of some actually existing catalogue, which may serve as a stepping-stone to the ideal catalogue of the future.