3. There can be no doubt that of such habitations consisted the villages and towns of those first settlers. They gave quite sufficient shelter in the very mild winters of that region, and, when coated with a layer of mud which soon dried and hardened in the sun, could exclude even the violent rains of that season. But they were in no way fitted for more ambitious and dignified purposes. Neither the palaces of the kings nor the temples of the gods could be constructed out of bent reeds. Something more durable must be found, some material that would lend itself to constructions of any size or shape. The mud coating of the cabins naturally suggested such a material. Could not this same mud or clay, of which an inexhaustible supply was always on hand, be moulded into cakes of even size, and after being left to dry in the sun, be piled into walls of the required height and thickness? And so men began to make bricks. It was found that the clay gained much in consistency when mixed with finely chopped straw--another article of which the country, abounding in wheat and other grains, yielded unlimited quantities. But even with this improvement the sun-dried bricks could not withstand the continued action of many rainy seasons, or many torrid summers, but had a tendency to crumble away when parched too dry, or to soak and dissolve back into mud, when too long exposed to rain. All these defects were removed by the simple expedient of baking the bricks in kilns or ovens, a process which gives them the hardness and solidity of stone. But as the cost of kiln-dried bricks is naturally very much greater than that of the original crude article, so the latter continued to be used in far greater quantities; the walls were made entirely of them and only protected by an outward casing of the hard baked bricks. These being so much more expensive, and calculated to last forever, great care was bestowed on their preparation; the best clay was selected and they were stamped with the names and titles of the king by whose order the palace or temple was built, for which they were to be used. This has been of great service in identifying the various ruins and assigning them dates, at least approximately. As is to be expected, there is a notable difference in the specimens of different periods. While on some bricks bearing the name of a king who lived about 3000 B.C. the inscription is uncouth and scarcely legible, and even their shape is rude and the material very inferior, those of the later Babylonian period (600 B.C.) are handsome and neatly made. As to the quality, all explorers agree in saying it is fully equal to that of the best modern English bricks. The excellence of these bricks for building purposes is a fact so well known that for now two thousand years--ever since the destruction of Babylon--its walls, temples and palaces have been used as quarries for the construction of cities and villages. The