The utility of such a register in London, at the approaching Industrial Fair, as we presume to call it, is easily seen. Let us suppose Count Smorltork arriving in England with the intention of writing an account of the Exposition. He has only a few days to make his observations; and it is not till he has driven half over London, that he discovers of Lord Tomnoddy and Sir Carnaby Jenks—from whom he expects to derive his chief information—that one is at Leamington, and the other in Scotland. Or we may imagine Dr. Dommheit, with the grave Senor Eriganados, and their volatile coadjutor, M. de Tête-vide, arriving in our capital on a scientific excursion. It costs them a month’s income in messengers and cab-fares, and a week’s waiting while their strangely spelt letters are decyphered at the Post-Office, before they learn that Mr. Crypt is off with Lord Rhomboid and the Chrononhotonthologos Society, somewhere in the provinces; Dr. Dryasdust is looking for antiquities in the Hebrides; and the oracle of their tribe, Earl Everlasting—having been left alone with the secretary and the porter at the sixth hour of the reading of his paper on the antediluvian organisms of a piece of slate—has gone down to his “place” in Dorsetshire in a huff. On the other hand, the famous Dr. Ledern Langweile, Monsieur de Papillon-Sauvage, and the great Condé Hermosa-Muchacha-Quieres, are going crazy because they cannot find each other; yet all are perhaps dwelling within a stone’s throw of each other; perhaps in the same street or square—most probably Leicester Square, which they have been given to understand is the most fashionable quarter of the town. This is exactly the condition of things which may be expected without such a register of names and addresses as we suggest. To our own men about town, also, or to “ladies of condition,” as Addison’s Spectator has it, the Strangers’ Leaf will be invaluable. None have so little time as the idle; and how severely Indolence will have to work for the benefit of its foreign and provincial friends in 1851, it must tremble to anticipate. To relieve it a little, some such means as we suggest should be adopted, for allowing Indolence to find out easily those strangers who have been recommended to his attention and good offices. One glance at a list of “arrivals” would save it a world of trouble.