Does it ever occur to an ordinary member of the community how letters are sorted? And if so, what has the thinking member made of it? We fear the idea would wear a somewhat hazy complexion. This is how it is done in Edinburgh, for example. The letters when posted are of course found all mixed together, and bearing addresses of every kind. They are first arranged with the postage-stamps all in one direction, then they are stamped (the labels being defaced in the process), and thereafter the letters are ready to be sorted. They are conveyed to sorting frames, where a first division is carried out, the letters being divided into about twenty lots, representing roads or despatching divisions, and a few large towns. Then at these divisions the final sortation takes place, to accord with the bags in which the letters will be enclosed when the proper hour of despatch arrives. This seems a very simple process, does it not? But before a sorter is competent to do this work, he must learn "circulation," which is the technical name for the system under which correspondence flows to its destination, as the blood courses through the body by means of the arteries and veins. By way of contrast to what will be stated hereafter, it may be convenient to see how letters circulated less than a hundred years ago. In 1793 the London mail arrived at Glasgow at 6 o'clock in the morning, but the letters for Paisley did not reach the latter place till 11 A.M.--that is, five hours after their arrival in Glasgow, though the distance between the places is only seven miles. A couple of years before that, letters arriving at Edinburgh on Sunday morning for Stirling, Alloa, and other places north thereof, which went by way of Falkirk, were not despatched till Sunday night; they reached Falkirk the same night or early on Monday morning, and there they remained till Tuesday morning, when they went on with the North mail--so that between Edinburgh and Falkirk two whole days were consumed. In the year 1794 the London mail reached Edinburgh at 6 A.M., unless when detained by bad weather or breakdowns. The letters which it brought for Perth, Aberdeen, and places on that line, lay in Edinburgh fourteen hours--viz., till 8 P.M.--before being sent on. The people of Aberdeen were not satisfied with the arrangement, and as the result of agitation, the hour was altered to 1 P.M. This placed them, however, in no better position, for the arrival at Aberdeen was so late at night, that the letters could only be dealt with next day. It was not easy to accommodate all parties, and there was a good deal of trouble over this matter. The Edinburgh newspapers required an interval, after the arrival of the London mail, for the printing of their journals and preparing them for the North despatch. The Aberdeen people thought that an interval of three hours was sufficient for all purposes, and urged that the North mail should start at 9 A.M. In one of their memorials they