The apparatus by which in the present day bags of letters are dropped from and taken up by the travelling post-office while the trains are running at high speed had its prototype in the days of the mail-coaches. In the one case as in the other the object was to get rid of stoppages, and so to save time. In the coaching days the apparatus was of a most primitive kind, consisting of a pointed stick rather less than four feet long, whose sharpened end was put in behind the string around the neck of the mail-bag, and on the end of the stick the bag was held up to be clutched by the mail guard as the coach went hurriedly by. We are indebted to the sub-postmaster of Liberton, a village a few miles out of Edinburgh, for a description of the arrangement. He describes how the guards, some fifty years ago, would playfully deal with the youngsters who worked the "apparatus," by not only seizing the bag but also the stick, and causing the young people to run long distances after the coach in order to recover it. The fun was all very well, says the sub-postmaster, in the genial nights of summer; "but when the cold nights of winter came round, it was our turn to play a trick upon the guard, when both he and the driver were numbed with cold and fast asleep, and the four horses going at full speed. It was not easy to arouse the guard to take the bag; and just fancy the rare gift of Christian charity that caused us youngsters to run and roar after the fast-running mail-coach to get quit of the bag. It used to be a weary business waiting the mail-coach coming along from the south when the roads were stormed up with snow or otherwise delayed. It required some tact to hold up the bag, as the glare of the lamps prevented us from seeing the guard as he came up with his red coat and blowing a long tin horn." Some curious notions were prevalent of the effect of travelling by mail-coach--the rate being about eight or ten miles an hour. Lord Campbell was frequently warned against the danger of journeying this way, and instances were cited to him of passengers dying of apoplexy induced by the rapidity with which the vehicles travelled. In 1791 the Postmaster-General gave directions that the public should be warned against sending any cash by post, partly, as he stated, "from the prejudice it does to the coin by the friction it occasions from the great expedition with which it is conveyed." After all, speed is merely a relative thing. [Illustration: MODERN MAIL "APPARATUS" FOR EXCHANGE OF MAIL-BAGS: SETTING THE POUCH--EARLY MORNING.]