Rats are as lascivious as voracious; they have a kind of yelp in their amours, and when they fight they cry. They prepare a bed for their young, and almost immediately provide them with food; and when they first quit their hole the mother watches, defends, and will even fight the cats to save them. A large rat is more mischievous, and almost as strong as a young cat; its fore-teeth are long and strong; and as the cat does not bite hard, but is obliged to depend upon her claws, she must not only be vigorous but well experienced in warfare. The weasel, though smaller, is yet a more dangerous enemy, because he can follow the rat into its hiding places: the combat between these two is often sharp and long, from their strength being nearly equal, but their manner of fighting is different. The rat can only wound by snatches, and with his fore-teeth, which are more calculated for gnawing than biting, and have but little strength; whereas the weasel bites fiercely with his whole jaw, and instead of letting go sucks the blood thro' the wound, and therefore the rat always falls a victim to this formidable enemy. There are many varieties in this species, as in all those which have numerous individuals. Besides the common rat which is nearly black, there are some brown, grey, reddish, and quite white. The white rat, like all animals perfectly white has red eyes. The whole species, with all its varieties, appear to be natives of temperate climates, and have been diffused in much greater abundance over warm countries than cold ones. Originally they had none in America, but were transported with the first European settlers, and where they increased so fast as to become the pest of the colonies, and where indeed they had no enemies but the large serpents which swallowed them up alive. The European ships have also carried them into the East Indies, all the islands of the Indian Archipelago, and into Africa, where they are now found in great numbers. In the north they have never multiplied beyond Sweden, and those which are called Norway and Lapland rats, are animals of a different species. SUPPLEMENT. It is asserted by Pontoppidan, that rats cannot live further north than Norway, and that those on the banks of the south side of the river Vorman, very soon die if they are taken to the north, which he attributes to the exhalations of the soil. From the Vicomte Querhoënt I understand that rats multiplied so fast on their first introduction to the isle of France, as even to compel the Dutch to leave it: they have been somewhat lessened by the French, but they still remain in great numbers. He adds, that when a rat has resided some time in India he acquires a very strong smell of musk; and this is confirmed by M. la Boullaye-le-Goux in his voyages. The Dutch voyagers also say that there are scented rats in Madura. THE MOUSE.