General correspondence and related papers concerned mainly with instruments, including letters on the aluminising of the 36-inch mirror; letters on the furnishing of the offices at Herstmonceux; a letter from D. Brouwer to M.S. Zverev informing him of the findings of a conference held at the Dearborn Observatory, Illinois, on astronomic problems; confirmation of the dispatch of Eros reference plates to D. Brouwer at Yale; a drawing showing the method of mounting ball and roller bearings for the polar and declination axis for the 26-inch photo-equatorial telescope; minutes of a meeting regarding dial and chronograph circuits held at the Royal Greenwich Observatory on 28 January 1954; a copy of the Royal Aircraft Establishment, Farnborough, technical note no. 335, September 1945, regarding tests on the Ross 25-inch prototype lens; and an account of the measurement and reduction of the plates of the Royal Observatory, Cape of Good Hope, for the zones -56° to -60°, and notification of the dispatch to R.H. Stoy at the Cape Observatory of all the materials used for the Cape Zone -56° to -60°.