The ship-rat must not be confounded with the water-rat, which is an entirely different species. The latter partakes of the habits of the beaver, and is somewhat like him in appearance. He possesses the same bluff head and long fur, in which are buried his diminutive ears. He dwells in holes in the banks of rivers, which he constructs with a land and water entrance to provide against destruction by the sudden rising of the stream. This animal lives entirely upon vegetable food, which he will now and then seek at some distance inland, and we suspect that to him may be traced many of the devastations in the fruit and vegetable gardens for which the poor sparrows get the blame. We have seen water-rats cross a wide meadow, climb the stalks of the dwarf beans, and, after detaching the pods with their teeth, shell their contents in the most workmanlike manner. They will mount vines and feed on the grapes; and a friend informs us that on one occasion he saw a water-rat go up a ladder which was resting against a plum-tree, and attack the fruit. If a garden is near the haunts of water-rats, it is necessary to watch narrowly for the holes underneath the walls, for they will burrow under the foundation with all the vigour of sappers and miners. Such is the cunning with which they drive their shafts, that they will ascend beneath a stack of wood, a heap of stones, or any other object which will conceal the passage by which they obtain an entrance. The water-rat is, however, a rare animal compared with its first-cousin, the common brown or Norway rat, which is likewise, as Lord Bacon says of the ant, "a shrewd thing in a garden." They select, according to Cobbett, the prime of the dessert--melons, strawberries, grapes, and wall-fruit; and though they do but taste of each, it is not, as he remarks, very pleasant to eat after them. Not many years since they existed in millions in the drains and sewers of the metropolis. Several causes have been in operation to diminish their numbers, and in some quarters of the town almost wholly to extinguish them. In the first place, the method of flushing the sewers lately adopted is exceedingly fatal to them. When the sluices are opened, go they must with the rush of waters, and they may be seen shot out by hundreds from the mouths of the culverts in the Thames. The fact that rats are worth three shillings a dozen for sporting purposes proves, however, the most certain means of their destruction, for it insures their ceaseless pursuit by the great hunter, man. The underground city of sewers becomes one vast hunting-ground, in which men regularly gain a livelihood by capturing them. Before entering the subterraneous world, the associates generally plan what routes they will take, and at what point they will meet, possibly with the idea of driving their prey towards a central spot. They go in couples, each man carrying a lighted candle with a tin reflector, a bag, a sieve, and a