The principle of a sliding or hanging-press is, so far as I know, entirely peculiar to the British Museum, and hardly could have originated elsewhere than in a building possessing, like the Museum, floors and ceilings entirely grated. The main point, however, the provision of supplementary presses to increase the capacity of the library without requiring additional space, had previously been worked out in at least two libraries. The earliest example, apart from casual and accidental applications at Trinity College, Dublin, and, as I have been told, the Bodleian, was, I believe, at Bradford Free Library, and the gentleman entitled to the credit of its introduction there was Mr. Virgo, the librarian. Mr. Virgo's contrivance was, I understand, a double door, not hinged on to the original press in one piece, as in the pattern I have just described, but opening in two divisions to right and left, as frequently the case in cupboards. I speak, however, with some uncertainty, for when, writing on the subject in Mr. Dewey's _Library Notes_, and most anxious to give Mr. Virgo all due credit, I applied to him for particulars of his invention, modesty, as I must suppose, rendered him silent, or at best but insufficiently articulate. I hope he may be present to-day, and that the Conference may hear the particulars from himself. It is due, however, to the Bethnal Green Library, the other institution to which I have referred as having given effect to the principle of press expansion _in situ_, to state most explicitly that the idea of its application at the Museum was derived wholly and solely from Bethnal Green; that the Bradford example, though it had been set for some years previously, was never heard of at the Museum until the model had been constructed and the first presses ordered; and that I am satisfied that Bethnal Green knew as little of Bradford as the Museum did. The Bethnal Green inventor was, I am informed, the late Dr. Tyler, the founder and principal benefactor of the institution, and, as elsewhere, the device was resorted to by him under the pressure of a temporary emergency—in this case the accumulation of specifications of patents annually presented by the Patent Office. The introduction of the principle at the Museum dates from a November evening of 1886, when, going down to attend a little festivity on occasion of the reopening of the Bethnal Green Library after renovation, I was shown the supplementary presses by the librarian, Mr. Hilcken. I immediately saw the value of the idea, and next morning sent for Mr. Jenner, assistant in the Printed Book Department, in whose special fitness I felt great confidence, from his admirable performance of the duty of placing the books daily added to the Museum, which frequently requires much ingenuity and contrivance. I told Mr. Jenner what I had seen, and desired him to consider whether he could devise a method of adapting the Bethnal Green system to the exigencies of the British Museum. He did