Post Office. Copies of a letter from the Postmaster-General, dated 24 February 1859; and of a minute and memorandum, prepared by the Secretary to the Post Office, relative to the regulation recently promulgated as to the compulsory prepayment of postage on inland letters enclosed therein; and of the Treasury warrant, repealing the warrant of 29 January 1859, which requires compulsory prepayment of inland letters [electronic resource].