Here and there, near the fences and along the borders of the wood, these X-ray eyes would see the chipmunk at the end of his deep burrow with his store of nuts or grains, sleeping fitfully but not dormant. The frost does not reach him and his stores are at hand. One which we dug out in late October had nearly four quarts of weed-seeds and cherry-pits. He will hardly be out before March, and then, like his big brother rodent the woodchuck, and other winter sleepers, his fancy will quickly "turn to thoughts of love." One would see the woodchuck asleep in his burrow, snugly rolled up and living on his own fat. All the hibernating animals that keep up respiration, must have sustenance of some sort--either a store of food at hand or a store of fat in their own bodies. The woodchuck, the bear, the coon, the skunk, the 'possum, lay up a store of fuel in their own bodies, and they come out in the spring lean and hungry. The squirrels are lean the year through, and hence must have a store of food in their dens, as does the chipmunk, or else be more or less active in their search all winter, as is the case with the red and gray squirrels. The fox puts on more or less fat in the fall, because he will need it before spring. His food-supply is very precarious; he may go many days without a morsel. I have known him to be so hungry that he would eat frozen apples and corn which he could not digest. The hare and the rabbit, on the other hand, do not store up fat against a time of need; their food-supply of bark and twigs is constant, no matter how deep the snows. The birds of prey that pass the winter in the north take on a coat of fat in the fall, because their food-supply is so uncertain; the coat of fat is also a protection against the cold. Of course, all the wild creatures are in better condition in the fall than in the spring, but in many cases the fat is distinctly a substitute for food. The skunk is in his den also from December till February, living on his own fat. Several of them often occupy the same den and conserve their animal heat in that way. The coon, also, is in his den in the rocks for a part of the winter, keeping warm on home-made fuel. The same is true of the bear in our climate. The bats are hibernating in the rocks or about buildings. The muskrats are leading hidden lives in the upper chambers of their snow-covered houses in the marshes and ponds or in the banks of streams, feeding on lily-roots and mussels which they get under the ice.