By an act of Congress passed at the Third Session of the Thirty-Seventh Congress, December 1, 1862, to March 4, 1863, “The postmaster-general may arrange for the delivery by route-agents of newspaper bundles not taken from, or intended for, any post-office. The postmaster-general may regulate the manner of wrapping mail-matter not paying letter postage, so that it may be easily examined; and postmasters are allowed to tear off the wrappers to see if letter postage is evaded. Publishers dealing with the post-office must swear to their statements: there is a fine of $50 for each offence in sending papers to other than subscribers at quarterly rates. The franking privilege is limited as follows: first, the President, by himself or his private secretary; second, the Vice-President; third, the chiefs of the several executive departments; fourth, such principal officers, being heads of bureaus or chief clerks, of each executive department, to be used only for official communications, as the postmaster-general shall prescribe; fifth, Senators and Representatives, including delegates from Territories, the Secretary of the Senate and Clerk of the House, to cover correspondence to and from them, and all printed matter issued by authority of Congress, and all speeches, proceedings, and debates in Congress, and all printed matter sent to them,—their franking privilege to commence with the term for which they are elected, and to expire on the first Monday of December following such term of office; sixth, all official communications addressed to either of the executive departments by an officer responsible to that department: in all such cases the envelope should be marked ‘official,’ with the signature thereto of the officer; seventh, postmasters have the franking privilege for official communications to other postmasters: in such cases the envelope shall be marked ‘official,’ with the signature of the writer, and for any such endorsement of ‘official’ falsely made, the person making the same shall forfeit $300; eighth, petitions to either branch of Congress shall pass free in the mails; ninth, all communications addressed to any of the franking officers above described, and not excepted in the foregoing clauses, must be prepaid by postage-stamps. The franking privilege shall be limited to packages weighing not exceeding four ounces, except petitions to Congress and congressional or executive documents, and publications published, procured, or purchased by order of either house, which shall be considered as public documents and entitled to be franked as such; and except, also, seeds, cuttings, roots, and scions, the weight of the packages of which may be fixed by regulations of the postmaster-general. Publishers of periodicals, magazines, and newspapers which shall not exceed sixteen ounces in weight shall be allowed to interchange their publications reciprocally free of postage, such interchange to be confined to a single copy of each publication.”