background, and to enforce that of the publication of single articles complete in themselves which would be valuable as special bibliographies. A mere fragment of letter A, it was manifest, could be of little use beyond the walls of the Museum, but a separate issue of the article Aristotle might have great worth. The situation was entirely altered when the Treasury so increased their grant as to afford a reasonable prospect of finishing the catalogue in twenty years instead of forty. The fragmentary system of publication was thereupon quietly dropped, and printing went on in steady alphabetical sequence. It is due to the Treasury to state that, since this augmentation of the grant, their treatment of this branch of the Museum service has been uniformly liberal. It is to be hoped that this bountiful spirit will not expire with the completion of the catalogue, but will find expression in a reprint incorporating all the accessions which have grown up while it has been at press, as proposed in a very able article in the _Quarterly Review_ for October 1898. After the application of print to the catalogue, mechanical process has rendered no such service to the British Museum Library as the introduction of the sliding-press, the subject of another essay. While, however, printing was the result of half a century of incessant controversy, the sliding-press seemed to fall from the clouds. Its introduction was a _coup d'état_; five minutes sufficed to convince the Principal Librarian of the soundness of the idea, and the thing was virtually done. No more striking contrast can be conceived than that between the condition of the Library the day before this feasibility was demonstrated, oppressed by the apparently insoluble problem how to find room for its books, and the condition of the Library the day after solution, suddenly endowed with a practically indefinite capacity for expansion, save only in the department of newspapers. No one unacquainted with the internal economy of the Museum will fully appreciate the saving of public money, to say no more, effected by this simple contrivance.