A register of official letters of 25 June 1874 to 4 October 1887. Each letter is numbered by year, and includes the date, address, a brief account of the subject, the number of enclosures, the subject of the enclosures and an index to classification. Most of the letters are addressed to the Secretary of the Admiralty, with others addressed to the Director of Stores, the Accountant General of the Navy, the Director of Works and the Hydrographer. They concern financial matters, mainly claims and estimates.