A peculiar formation of the incisors, or front teeth, groups a number of smaller animals together under the name of Rodentia, from the Latin word rodens, which signifies gnawing. These teeth act as files, so that the food on which their owners principally live is reduced by friction to a state which fits it for digestion. As the edges of these teeth become worn by constant use, they incessantly grow from the root. If one be broken, that opposite to it, in the other jaw, being deprived of its habitual wear and tear, grows so fast that it not only annoys its owner, but has caused his destruction by effectually closing the mouth. Their lower jaws can only move backwards and forwards; some exclusively eat vegetables, others eat all things, and others again prefer flesh. Some carry their food to their mouths with their paws, and climb trees; and, in many, the hinder limbs are so much longer than those in front, that they leap instead of walk. They are widely and numerously spread on the surface of the earth, and therefore bear strongly on its history; but it is not among them that we find the high intellectual development with which many other animals are gifted. Squirrels are some of the most beautiful of the These animals have a large bushy tail, the hair of which spreads out on each side like a feather; and by it they are guided and supported when they leap. The flying squirrels, as they are called, have an expansion of the skin of the sides, which extends between the hind and fore legs, by which they are suspended in the air when passing from tree to tree, and by it are enabled to go to greater distances without being actually able to fly, as their name would imply. The general colour of the English squirrel is red in summer; but in winter they often assume a grayish tint, at which time they have long pencils of hair at the top of their ears. This grey becomes more decided in more northern climates; and Sir Francis Head gives us the following account of his meeting with a squirrel in Canada. "I was waiting the approach of a large flock of wild fowl; but a little villain of a squirrel on the bough of a tree close to me, seemed to have determined that even now I should not rest in quiet; for he sputtered and chattered with so much vehemence, that he attracted the attention of my dog. This was truly mortifying; for he kept his eyes fixed on the squirrel. With my hand I threatened the little beast; but he actually set up his back and defied me, becoming even more passionate than before; till, all of a sudden, as if purposely to alarm the game, he dropped plump within a couple of yards of Rover's nose. This was too much for the latter to bear, so he gave a bounce and sprang upon the impertinent squirrel; who, in a second, was out of his reach, cocking his tail and shewing his teeth, on It is from Captain Brown's pages that I extract the following. "A gentleman procured a squirrel from a nest, found at Woodhouse, near Edinburgh, which he reared and rendered extremely docile. It was kept in a box below an aperture, where was suspended a rope, by which the animal ascended and descended. The little creature used to watch very narrowly all its master's movements; and, whenever he was preparing to go out, it ran up his legs, and entered his pocket, from whence it would peep out at passengers as he walked along the streets, never venturing however to go out. "But no sooner would he reach the outskirts of |