We are apt to suppose that the wild inhabitants of the New World have ever existed in the same savage state as that in which they are found. Vast numbers, however, of remains, and buildings of great antiquity, have of late years been discovered, showing that at one time either their ancestors, or other tribes who have passed away, had made great progress in civilisation. As the white man has advanced westward, and dug deep into the soil, whilst forming railway cuttings, digging wells, and other works, numerous interesting remains have been discovered--a large number of fortified camps of vast extent, and even the foundations of cities, with their streets and squares, have been brought to light. Idols, pitchers of clay, ornaments of copper, circular medals, arrowheads, and even mirrors of isinglass, in great numbers, have been found throughout the country. Some of the articles of pottery are skilfully wrought, and polished, glazed, and burned; inferior in no respects to those of Egypt and Babylon. In Tennessee, an earthen pitcher, holding a gallon, was discovered on a rock twenty feet below the surface. It was surmounted by the figure of a female head covered with a conical cap. The features greatly resembled those of Asiatics, and the ears, extending as low as the chin, were of great size. Near the Cumberland River an idol formed of clay was found about four feet below the surface of the earth. It is of curious construction, consisting of three hollow heads joined together at the back by an inverted bell-shaped hollow stem. This specimen also has strongly-marked Asiatic features; the red and yellow colour with which it is ornamented still retaining great brilliancy. Another idol, formed of clay and gypsum, was discovered near Nashville. It represented a human being without arms. The hair was plaited, and there was a band round the head with a flattened lump or cake upon the summit. Numerous medals, also, have been dug up, representing the sun, with its rays of light, together with utensils and ornaments of copper, sometimes plated with silver; and a solid silver cup, with its surface smooth and regular, and its interior finely gilt.