Among the earliest inhabitants of Europe, there were some who did not live in caves; but I think they must have lived a long time after the cave-dwellers, when they built their houses out in the middle of the lakes. These houses were built in a very curious way, and the remains of them have been discovered in Ireland and Scotland, Switzerland and other countries. The people carried quantities of stones, and earth, and sticks out into the lake and let them sink to the bottom. Then when they had piled up enough to make an island, they laid wood across and set up their huts, and lived there surrounded by water. These were very poor houses of course; but when men had begun to build for themselves, they would find how much more comfortable they were than in damp and dark caves. They must have had some kind of boats or canoes, or they could not have passed between their lake-dwellings and the land unless they swam to them; but I do not think that any of these boats have been found. Perhaps they were made of the dried skins of animals stretched over wooden frames, as I have seen savages make boats. [Illustration: XII. _Lake-Dwellings._] There was another way of building these lake-dwellings, and a better way too. Long poles were driven into the earth at the bottom of the water, and when the builders had got enough of these together they laid other poles across them, and built their huts on this floor above the water. People are living now in much the same way near the Orinoco river in South America, in New Guinea, and in Central Africa.[26] The land all round is covered with water from the overflowing of the rivers, which are very large, and the huts are built up on these poles out of the way of it. The lake-dwellers of Europe would thus be safer in their houses from dangerous animals than if they were on land. They were more civilized than the cave-dwellers, but still a great many of their tools and weapons were of stone and bone; yet we know that they had made wonderful progress, because they had learned to make pottery, and even to weave cloths out of hemp or flax. They had most likely begun to plant and cultivate the land, too, for corn is found about these dwellings, and the bones of domestic animals are very numerous. They had left the cave-dwellers a long way behind in many things, in wearing artificial clothing, in cultivating the land, and in keeping domestic animals; but their implements—that is, their weapons and tools—were not much improved, and were very much like those of the cave-dwellers, though better finished and more polished than some of theirs. But not all the articles used by the lake people were of stone and bone. Some of those who lived in the Swiss lakes had ornaments, such as bracelets and hair-pins, made of the metal called bronze, and no doubt they made spear-heads of the metal, because they would look to usefulness before ornament.