In fact, I believe that the sliding-press is only one corner of a great question, and that in planning large libraries it will be necessary to take mechanical contrivances into account to a much greater extent than hitherto. I am especially led to this conclusion by some particulars which have reached me respecting the new Congressional Library at Washington. I am unable to state these with the requisite accuracy, but I hope that some American friend may be present who can supply the deficiency. I have to add that the photographs of the sliding-press here exhibited by me were taken by Mr. Charles Praetorius, and that copies can be obtained from him. He may be addressed at the Museum. I hope that they fulfil their purpose; they cannot, however, of course, represent the press so well as the model of it constructed by Mr. Sparrow for the exhibition of library appliances at Antwerp, where it was shown last year. This is now exhibited to the public in the King's Library, and Mr. Sparrow could probably produce copies of it if desired. An account of the press was contributed by Mr. Jenner to the _Library Chronicle_, and by me to Mr. Melville Dewey's _Library Notes_, both in 1887. FOOTNOTES: [262:1] Read at the Annual Meeting of the Library Association, held at Nottingham, September 1891. [269:1] Since this was written, the engineers of the Board of Works have reported that the sliding-press system can be safely extended to the galleries, which more than doubles the estimate of increased space given on the preceding page. ON THE PROVISION OF ADDITIONAL SPACE IN LIBRARIES[272:1]