Official and general correspondence on standards. The correspondents include Sir J.F.W. Herschel, Sir J. Lefevre, Sir J.W. Lubbock, Professor W.H. Miller, Major General E. Sabine, Lord Wrottesley, W. Airy, W. De La Rue, Admiral Manners and Professor Wackenbath. The volume includes minutes of the first meeting of the Standards Commission; the first report of the Standards Commission; and papers on the decimal system of money.