Of all the calamities with which a great city is infested, there can be none so truly awful as that of a plague, when the street doors of the houses that were visited with the dreadful pest were padlocked up, and only accessible to the surgeons and medical men, whose melancholy duty frequently exposed them even to death itself; and when the fronts of the houses were pasted over with large bills exhibiting red crosses, to denote that in such houses the pestilence was raging, and requesting the solitary passenger, to pray that the Lord might have mercy upon those who were confined within. Of these bills there are many extant in the libraries of the curious, some of which have borders engraved on wood printed in black, displaying figures of skeletons, bones, and coffins They also contain various recipes for the cure of the distemper. The Lady Arundel, and other persons of distinction, published their methods for making what was then called plague-water, and which are to be found in many of the rare books on cookery of the time; but happily for London, it has not been visited by this affliction since 1665, a circumstance owing probably to the Great Fire in the succeeding year, which consumed so many old and deplorable buildings, then standing in narrow streets and places so confined, that it was hardly possible to know where any pest would stop. [Illustration [++] Corpse Bearer.] Every one who inspects Agas's Plan of London, engraved in the reign of Elizabeth, as well as those published subsequently to the rebuilding of the City after the fire, must acknowledge the great improvements as to the houses, the widening of the streets, and the free admission of fresh air. It is to be hoped, and indeed we may conclude from the very great and daily improvements on that most excellent plan of widening streets, that this great city will never again witness such visitations. When the plague was at its height, perhaps nothing could have been more silently or solemnly conducted than the removal of the dead to the various pits round London, that were opened for their reception; and it was the business of Corpse Bearers, such as the one exhibited in the preceding engraving, to give directions to the carmen, who went through the city with bells, which they rang, at the same time crying "Bring out your Dead." This melancholy description may be closed, by observing that many parts of London, particularly those leading to the Courts of Westminster, were so little trodden down, that the grass grew in the middle of the streets. A MEMENTO-MORI WATCH. The curious relic, of which we herewith give an engraving, was presented by Mary, Queen of Scots, to her Maid of Honour, Mary Seaton, of the house of Wintoun, one of the four celebrated Maries, who were Maids of Honour to her Majesty. "Yestreen the Queen had four Maries, The night she'll hae but three; There was Marie Seaton, and Marie Beaton, And Marie Carmichael and me."