If heat were visible, or if we should represent it say by smoke, then the December landscape would present a curious spectacle. We should see the smoke lying low over the meadows, thickest in the hollows and moist places, and where the turf is oldest and densest. It would cling to the fences and ravines. Under every evergreen tree we should see the vapor rising and filling the branches, while the woods of pine and hemlock would be blue with it long after it had disappeared from the open country. It would rise from the tops of the trees, and be carried this way and that with the wind. The valleys of the great rivers, like the Hudson, would overflow with it. Large bodies of water become regular magazines in which heat is stored during the summer, and they give it out again during the fall and early winter. The early frosts keep well back from the Hudson, skulking behind the ridges, and hardly come over in sight at any point. But they grow bold as the season advances, till the river's fires, too, I are put out and Winter covers it with his snows. XI One of the strong and original strokes of Nature was when she made the loon. It is always refreshing to contemplate a creature so positive and characteristic. He is the great diver and flyer under water. The loon is the genius loci of the wild northern lakes, as solitary as they are. Some birds represent the majesty of nature, like the eagles; others its ferocity, like the hawks; others its cunning, like the crow; others its sweetness and melody, like the song-birds. The loon represents its wildness and solitariness. It is cousin to the beaver. It has the feathers of a bird and the fur of an animal, and the heart of both. It is as quick and cunning as it is bold and resolute. It dives with such marvelous quickness that the shot of the gunner get there just in time "to cut across a circle of descending tail feathers and a couple of little jets of water flung upward by the web feet of the loon." When disabled so that it can neither dive nor fly, it is said to face its foe, look him in the face with its clear, piercing eye, and fight resolutely till death. The gunners say there is something in its wailing, piteous cry, when dying, almost human in its agony. The loon is, in the strictest sense, an aquatic fowl. It can barely walk upon the land, and one species at least cannot take flight from the shore. But in the water its feet are more than feet, and its wings more than wings. It plunges into this denser air and flies with incredible speed. Its head and beak form a sharp point to its tapering neck. Its wings are far in front and its legs equally far in the rear, and its course through the crystal depths is like the speed of an arrow. In the northern lakes it has been taken forty feet under water upon hooks baited for the great lake trout. I had never seen one till last fall, when one appeared on the river in front of my house. I knew instantly it was the loon. Who