Letters private. Secretary's Office, Division of Science. Department of Science & Art [being the out-letterbook of Lyon Playfair as secretary to the division, covering period 1854 Jan to 1856 Dec. He was secretary of the science division from the Science & Art Department's creation in 1853 and of the united department from 1855 to 1858] Letters private, Secretary's Office, Division of Science. Department of Science & Art 1854-1856
