We have already directed the attention of those engaged in frequent correspondence, especially with our colonies and foreign countries, to the necessity of consulting the official books published for their guidance. The following digest of Post Office regulations may, perhaps, answer the ordinary requirements of the general reader. THE LETTER-POST. As at present constituted, the British Post-Office has, with the few exceptions noticed in our historical survey, an exclusive authority to convey _letters_ within the United Kingdom. It is also required by law to convey newspapers when the public choose to use the post for that purpose. The Post-Office further undertakes the conveyance of books and book-packets, and the remittance of small sums of money. Still more recently, it has entered into competition with the banking interest of the country: it now threatens a scheme which will compete with benefit societies and insurance offices. It is only with regard to the carriage of letters, however, that the Post-Office possesses any special privileges, the other branches of its business being open to any person or persons who may choose to undertake them. (_a_) The rates of postage on all letters passing through the Post-Office are now regulated by weight,[206] irrespective of distance, and (with some exceptions, which we will mention presently) altogether irrespective of their contents. Letters weighing _less than four ounces_ may be sent unpaid, but they will be charged double postage on delivery. Letters may be sent insufficiently stamped, but that deficiency, whatever it may be, will also be charged double postage on delivery. The rate for letters is familiar to every reader. (_b_) All re-directed letters are liable to additional postage, but at the _prepaid_, and not the unpaid rate. Thus, for a letter under half an ounce, re-addressed from one post-town to another, additional postage, to the amount of one penny, is levied. Re-directed letters, not addressed to a fresh post-town, but to a place within the district belonging to the same post-town to which they were originally sent, are not charged with any additional postage, the first payment franking them until they are delivered. Letters for officers in the army and navy, and private soldiers and seamen employed on actual service, have their letters re-addressed to them from place to place without any charge for re-direction. (_c_) No letter, &c. can be forwarded through the post which is more than two feet in length, breadth, or depth, nor any unpaid letter or packet which weighs more than four ounces, unless three-quarters of the postage due on it have been paid. The exceptions to this rule are-- 1st. Packets sent to or received from places abroad. 2d. Packets to or from any of the Government departments or public officers. 3d. Petitions or addresses to the Queen, whether directed to Her Majesty or forwarded to any member of either House of Parliament.