It will be perhaps interesting at this stage to trace the travels of a letter to the furthest point in the British Isles. On this route we can bring out clearly the fact that in many parts of Great Britain and Ireland the Post Office, in spite of mail trains and ingenious mechanical contrivances, is still dependent on quite primitive means for conducting its business. Moreover, directly we get away from the main lines of traffic, considerations of weather still affect postal operations almost as much as they used to do in the old coaching days. Let us address a letter to the Muckle Flugga Lighthouse, which is situated to the north of the island of Unst in Shetland. Let us post the letter at King Edward's Building on a Sunday night at 6 P.M., and given favourable conditions of weather it will be delivered at the Muckle Flugga Lighthouse on Thursday morning. The letter is sorted into the Scottish division, is subsorted into a pigeon hole, and afterwards into a bundle labelled “Aberdeen forward.” The bundle is dropped into a bag inscribed with the words “London to Aberdeen,” and one of the familiar red vans conveys the bag to the London terminus. On Sunday nights this would be Euston. The bag is handed over to the sorters in charge of the Travelling Post Office, on which there is a mail carriage which runs direct to Aberdeen. Aberdeen is reached at 7.35 on Monday morning. So far the process of the letter has been simple and rapid. The bag containing the letters is conveyed to the Aberdeen Post Office, where it is opened, and the letters are again subsorted. The letter for Muckle Flugga is placed in a pigeon hole labelled “Lerwick,” and a sorter then checks all the postal packets very carefully, because, in consequence of the remoteness of the islands, serious delay would happen if any were mis-sent. Then they are tied in separate bundles and are placed in a strong waterproof sack labelled “Lerwick.” The Monday steamer goes to Scalloway on the west side of Shetland, other steamers during the week go to Lerwick _via_ Orkney, the steamer on Thursdays from Aberdeen sailing to Lerwick direct. But our letter is going to Scalloway, and it can arrive there about 2 P.M. on the Tuesday. The mails are then placed on a mail cart for conveyance to Lerwick on the east side of the island, six miles distant. At Lerwick the letter is again subsorted, and placed in another bag labelled “Lerwick to Haroldswick.” This place is on the island of Unst. The bag is conveyed by mail car leaving Lerwick at 9.15 P.M. on Tuesday, and this stage means a long drive of many miles north, with a break of a few hours at Voe. Mossbank, which is on Yell Sound, the dangerous channel which separates the island of Yell from the Shetland mainland, is reached at 7.30 A.M. on Wednesday. The bag for Haroldswick is here placed in a ferry-boat which starts at 8 A.M. and is due to reach the other side in an hour, the distance being three miles. The tide in Yell Sound has a