Coming down from the highlands to the lowlands where there were swamps and marshes or where inland lakes were numerous, we find that the first houses were built upon piles driven in the water or in the mud (Fig. 3). These lake-dwellings, as houses of this kind were called, were generally connected with the mainland by gangways of wooden piers, although sometimes they could be approached only by boat. In the floors of some of these curious dwellings were trapdoors through which baskets could be lowered for catching fish in the lake below. The children of the lake-dwellers were tethered by the feet to keep them from falling into the water. The beautiful city of Venice in its infancy was a community of lake-dwellers. The rough canoe of the lake-dwelling time has developed into the graceful gondola, and the rude wooden pier has grown to be the magnificent Rialto. [Illustration: FIG. 3.--LAKE-DWELLINGS, RESTORED. (From Troyon.)] In many regions the most convenient building material is stone and all over the earth there are proofs to show that building with stone began at a very early date. The stones in the earliest stone structures were rough and unhewn and were laid without mortar or cement (Fig. 4) yet they were sometimes fitted together with such nicety that a thin knife blade could not be passed between them. Remains of stone houses built many thousands of years ago may be seen in Peru, Mexico, Italy, and Greece. These primitive dwellings were humble and simple, but they were made of good material and they were well built. They have weathered the storms of ages and they have remained standing while later and more pretentious buildings have crumbled and disappeared. [Illustration: FIG. 4.--A PRIMITIVE STONE HOUSE.] The illustrations of early building which have been given will make plain the truth that the people of a particular country have taken the materials nearest at hand and have constructed their homes according to their particular needs. Now since the beginnings of house building have been different in different parts of the earth, the story of the house will not be the same in all countries. In China and Japan, where the light bamboo has always flourished and has always been used in building, the house has had one development; in countries where granite and marble and heavy timber abound it has had another and an entirely different development. What then is the story of the house as we see it in our country? Can this story be told? As one passes through an American city looking at the public buildings and churches and stores and dwellings can one go back to the beginning and trace step by step the growth of the house and tell how these came to be what they are? Let us see if this cannot be done. [Illustration: FIG. 5.--AN EGYPTIAN HOUSE.] [Illustration: FIG. 6.--AN ANCIENT HEBREW DWELLING.] [Illustration: FIG. 7.--INTERIOR OF AN ANCIENT EGYPTIAN PALACE.]