may be used with excellent effect in many instances, especially from its simplicity and ease of construction, when a sudden need arises for the accommodation of a new accession of books. I may further draw attention to a special merit—its singular lightness even when full of volumes. A child can work it with ease, unlike the sliding-press, which, when quite full, may tax the strength of a powerful man.
Respecting the history of this press I have only to say that, so far as I am aware, it originated with Mr. Mayhew at the British Museum; I should, nevertheless, be in no way surprised to learn that it, or something resembling it, had already been in use in other libraries. If so, this is not known at the Museum. It did not, like the sliding-press, come to us as an importation to be developed, but originated, so far as I know, entirely with Mr. Mayhew. If he took a hint from any quarter, it may have been from those revolving book-stands which some of us, no doubt, use in our own studies, so admirable for their compactness and the readiness with which the desired book is brought to hand, but unfortunately so dear. I do not know why they should always be constructed in wood, and have often thought that if Birmingham manufacturers would turn them out on a large scale in metal, they would meet with a remunerative demand.
I now come to the general question of providing space in libraries for indefinite future accessions. This does not seem to me to have as yet received attention in any degree proportionate to its
