"The pathway led to a large house on the edge of a lake, and, fortunately for us, the beaver was at home. There were other houses on an island in the lake, and below them all a large, strong dam, some thirty yards long, and below this two more complete dams across the river that flowed out. The dams were made of large tree-trunks, with quantities of lesser boughs, and were many feet thick, and very difficult to break down. The houses were built half on land, half in the water. The sitting-room is up-stairs on the bank, and so is the 'crew's' bedroom, and the front door is made at least three feet below the surface to prevent being 'frozen out' in winter, or, worse still, 'frozen in.'

"The whole house was neatly rounded off, and so plastered with mud as to be warm and weather-proof. This is done by means of their trowel-like tails, which are also of great use in swimming. The house was so strong that even with an axe we could not get in without very considerable delay.

"In the deep pond they had dammed up, we found a quantity of birch poles pegged out. The bark of these forms their winter food, and is called 'browse.' The beaver cuts off enough for dinner, and takes it into his house. Sitting up, he takes the stem in his fore paws, and rolls it round and round against his chisel-shaped incisor teeth, swallowing the long ribands of bark thus stripped off.... When surprised they retreat to holes in the bank, of which the entrances are hidden under water. These are called 'hovels.'

"Beavers always work up wind when felling trees, and cut them on the water side, so that they fall into the pond if possible, and the wind helps to blow them home. This beaver we caught proved to be a hermit—at least he was living alone. He may have been a widower of unusual constancy. They do not destroy fish, their food in summer being preferably the stems of the water-lilies. Otters occasionally kill and eat beavers. When they call, the beaver has to try and be 'not at home.'"

While the beaver evidently has strong feelings on the subject of the otter, who seems to be a burglar and a murderer, he apparently does not mind the lowly muskrat as a summer boarder, even though the latter does not pay for his lodging.

Of course the lord of the animate creation on land in the north—as the sperm whale is monarch of the sea—is the polar bear. Grenfell gives a most interesting account of this white king of beasts whom we properly pity on warm days as he lolls and pants by the soup-like water of his tank in one of our southern Zoos. The Doctor once saw a polar bear swimming three miles out at sea, headed, by a marvelous instinct, straight for the north. There was no convenient ice-pan floating near on which he might clamber for a snooze. This bear had been shot, and he floated high in the water, so that evidently his fat was a great help to him, enabling him to stay at sea as long as he pleased.

The polar bears wander from their native shores: they seem to enjoy travel, and when they sail south on pans of ice they are looking for that toothsome morsel, the seal.

If they cannot get seals, these bears devour the eggs of sea-birds on the islands.

When they swim after ducks, they hide under water, all but the nose: and since that nose is black, and therefore a telltale, they have been seen to bury it in the snow when creeping toward a seal-herd.

The polar bear stands a poor chance against a pack of lively and determined dogs.