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oversights will, no doubt, be detected, which a more deliberate procedure would have obviated. I do not desire to have the air of apologising for a catalogue which, even if tried by a severe standard, will, I am persuaded, be pronounced a creditable work; but I wish it to be understood that these blemishes, as well as some defects of arrangement manifested in long sets of cross-references, are not unknown or overlooked. They will diminish as the work proceeds; confident, meanwhile, of a generous construction, we are deliberately of opinion that it is infinitely better to run the risk of letting them pass than to open a door to the capital enemy of all good administration–arrear. Other shortcomings are necessitated by the fact that the Museum Library is not an inert mass, but a living organism. You have not to deal with a closed collection of books like the King's Library, whose authors are dead, and to which no addition can ever be made. The very titles before you have been prepared during the last forty years by twice forty persons of various idiosyncrasies, whose work, with every care, it is often no easy matter to harmonise. While the product of their heterogeneous authorship is at press, the Accession Catalogue is in progress under hide-pendent management; thousands of titles are annually written and entered which will one day have to be amalgamated with the general series, and discrepancies must sometimes occur. Moreover, the catalogue of the world's literature partakes of the mobility of the world itself. Designations are altered, as when successful generals become barons,