press mark E, we shall obtain a separate catalogue of the Civil War Tracts; and a similar proceeding as respects the titles marked F, will afford a similar catalogue of the Croker collection of pamphlets on the French Revolution. Classed indexes to the literature of any subject can be made with equal facility, and as several copies of the catalogue will be available for treatment in the manner suggested, they may be varied for different objects, or to suit different systems of classification. For all strictly Museum purposes it would suffice to paste the titles excerpted on sheets of paper, but any of the indexes thus prepared might be printed and published. The only difficulty or delay would arise from the incorporation of the supplementary titles, which, as already explained, will have been continually added during the printing of the catalogue, and even this could be obviated by reprinting the entire catalogue as suggested above.
These hints, imperfect as they are, should convince the reader that the future of the Museum Catalogue, supposing the institution to be maintained in its present condition of efficiency, will not be less remarkable than its past. It will continue to make demands on the liberality of successive generations, which will be the more readily met the more the voluminous development of literature enforces the conviction that, next to positive addition to the world's stock of information, the most important service to culture is the preserving, arranging, and rendering accessible the stores which
