In 1813 the following computation was made: "The annual value of the European Empire cannot be less than 25 millions sterling, and of this at least one fiftieth part, upon the lowest calculation, is eaten and destroyed by rats and mice; the public loss therefore is at least 500,000_l._ _per annum_, exclusive of the damage done in ships, in store houses, and buildings of every kind." The bite of the rat is keen, and the wound it inflicts painful and difficult to heal, owing to the form of its teeth, which are long, sharp, and irregular. It produces from twelve to eighteen at a litter, and were it not that these animals destroy each other, the country would soon be overrun with them. Mr. Bewick observes, "It is a singular fact in the history of these animals, that the skins of such of them as have been devoured in their holes, have frequently been found curiously turned inside out, every part being completely inverted, even to the ends of the toes." In addition to this remark of Mr. Bewick, it may be mentioned, that though the destruction of rats is so great among themselves, yet they are in some degree attached to each other, and have even their sports and pastimes. It is well known that a herd of rats will be defenders of their own holes, and that when a strange brood trespass upon their premises, they are sure to be set upon and devoured. They are active as the squirrel, and will, like that animal, sit up and eat their food. They play at hide and seek with each other, and have been known to hide themselves in the folds of linen, where they have remained quite still until their playmates have discovered them, in the same manner as kittens. Most readers will recollect the fable where a young mouse suggests that the cat should have a bell fastened to his neck, so that his companions might be aware of his approach. This idea was scouted by one of their wiseheads, who asked who was to tye the bell round the cat's neck? This experiment has actually been tried upon a rat. A bell was fastened round his neck, and he was replaced in his hole, with full expectation of his frightening the rest away, but it turned out that instead of their continuing to be alarmed at his approach, he was heard for the space of a year to frolick and scamper with them. In China the Jugglers cause their rats and mice to dance together to music, and oblige them to take leaps as we teach our cats. The following is a copy of a handbill distributed in Cornhill a few years ago: "A most wonderful Rat, the greatest natural curiosity ever seen in London. "A gigantic Female Rat, taken near Somerset House: it is truly worthy the inspection of the curious, its length being three feet three inches, and its weight ten pounds three quarters; and twenty-four inches in circumference. Any lady or gentleman purchasing goods to the amount of one shilling or upwards, will have an opportunity of seeing it gratis, at No. 5, Sweeting's Alley, Cornhill."