And then, to put the question entirely beyond dispute, they find that the glaciers are carrying down pebbles and stuff in just this way to-day, and piling it up in hills in the valleys at the foot of the mountains. Only the hills of to-day are much smaller, because the glaciers themselves are so small compared with the giants of the past. [Illustration: HOW THE OLD MEN MOVED THE HILL FURNITURE ABOUT This picture of a glacier in Alaska shows you just how the Old Men of the Mountain moved the hills about, that time. As indicated by the white lines--which, of course, were added to the picture for the purpose--the Alaska glacier melted back, leaving just such heaps of pebbles, boulders, and soil as made certain types of hills. Then from 1910 to 1913 it advanced again, thus picking up the very hills it had laid down and setting them farther along, just as the glaciers did in the Ice Age.] HOW THE HILL FURNITURE WAS MOVED ABOUT During the Ice Age, when glaciers were all the fashion, they flowed down, and then, as we have seen, melted back a certain distance; then they flowed down again. Sometimes in later visits they flowed further than before, and in so doing, you see, picked up some of the very hills they had previously laid down and set them along somewhere else. Sometimes we find different rows of hills, one right alongside the other. This shows where the glacier melted away toward the mountains, paused, then melted again and so on, each time leaving a group of hills and not coming back there and disturbing them any more. Such hills as we have been speaking of may be steep or gentle, and from a few feet to more than 1,000 feet high, although they are seldom as high as 1,000 feet. And there are other kinds of hills made by the glaciers. One of the most curious of these remind you of the serpent mounds left by the mound builders in Ohio. These hills are the deposits left by the streams, the veins inside the glacier's great body. The soil in them is also apt to be in layers like the deposits of other rivers. These hills wind along like serpents, because they reproduce the bends in the streams inside the glacier. Such hills are called "eskers." They are seldom more than a few rods wide and 10 feet or so in height. They run for 10, 20, 40, 50, and sometimes 100 miles. Around Boston, and all along Cape Cod and in parts of New York and Wisconsin, you will see other hills called "drumlins"; and you will see plenty of them, too. It is estimated that there are 6,000 in western New York and 5,000 in southern Wisconsin, and they are all around Boston. Bunker Hill is a drumlin. You wouldn't have to tell an Irish boy what "drumlin" means, as they have these hills in Ireland, too, and from Ireland came the name. The word means "little hill."