Even the water ouzel, that wonderful diver of the mountain lakes and waterfalls, might hesitate at a dive like that. Those remarkable old men of the mountains, the glaciers of the Ice Age, were the greatest of all lake-makers. Although for size the Great Lakes were their masterpieces, they made lakes of all sizes and no end of them. They fairly sowed the landscape with lakes. Look at the map of the lake regions of America and Europe and then turn back to the map picture of the great ice invasion (page 21). Don't you see the lake regions and what was once the ice regions cover practically the same territory? [Illustration: LOOKING ACROSS THE LAKE TO WIZARD ISLAND There you see is the top of that little volcano--right across the lake. It is known as "Wizard Island." The lake is 4,000 feet deep. Its walls are 1,500 feet high; in some places over 2,000 feet high. In spite of the fact that they, as you see, slope a good deal, owing to the crumbling down of the weathered rock, the banks are still so steep it has taken us several hours of careful climbing to get down where this picture was taken, and we shall be all the rest of the forenoon climbing back again. ] In addition to making lakes in their Great Lakes manner the glaciers had other methods. A glacier coming into a dry mountain valley would supply it with a river by melting, and at the same time dam up the river with stones and soil brought down from the mountain and so make a lake. Then the water would run over the brim of the dam, and the thing was complete; a beautiful little lake with one river running into it and another running out. LOOKS AS IF IT HAD RAINED LAKES! You just go through Wisconsin or Minnesota or Maine, and right and left you'll see lakes and lakes and lakes: and then more lakes! Of course most of these lakes are small; otherwise it wouldn't have been possible to work so many of them into the same landscape. In Wisconsin you find these small lakes in what are called the "Kettle Ranges." The low hills and their valleys form what the early settlers called "kettles," and in these kettles are the little blue-eyed lakes. It was the glaciers that not only made the kettles but often filled them with the lakes. In many of the mounds of pebbles and clay that we read about in "The Secrets of the Hills," the glaciers left big blocks of ice. Then, when this ice melted, two things happened: (1) The covering of the ice sank down, much as the sawdust sinks in an ice-house when a block of ice is taken out, thus making the kettle; (2) the big ice cake in the hill of pebbles melted, so filling the kettle with a lake.