[Illustration: Fig. 7.--Principal Figures of the Hopeton Works.] About 100 inclosures and 500 mounds have been examined in Ross County, Ohio. The number of mounds in the whole state is estimated at over 10,000, and the number of inclosures at more than 1500. The great number of these ancient remains in the regions occupied by the Mound-Builders is really surprising. They are more numerous in the regions on the lower Mississippi and the Gulf of Mexico than any where else; and here, in some cases, sun-dried brick was used in the embankments. One peculiarity at the South is, that while the inclosures are generally smaller and comparatively less numerous, there is a greater proportion of low mounds, and these are often larger in extent. Harrison Mound, in South Carolina, is 480 feet in circumference and 15 feet high. Another is described as 500 feet in circumference at the base, 225 at the summit, and 34 feet high. In a small mound near this, which was opened, there was found “an urn holding 46 quarts,” and also a considerable deposit of beads and shell ornaments very much decomposed. Broad terraces of various heights, mounds with several stages, elevated passages, and long avenues, and aguadas or artificial ponds, are common at the South. Figure 8 shows the remains of a graded way of this ancient people near Piketon, Ohio. [Illustration: Fig. 8.--Graded Way near Piketon, Ohio.] At Seltzertown, Mississippi, there is a mound 600 feet long, 400 wide, and 40 feet high. The area of its level summit measures 4 acres. There was a ditch around it, and near it are smaller mounds. Mr. J. R. Bartlett says, on the authority of Dr. M. W. Dickeson, “The north side of this mound is supported by a wall of sun-dried brick two feet thick, filled with grass, rushes, and leaves.” Dr. Dickeson mentions angular tumuli, with corners “still quite perfect,” and “formed of large bricks bearing the impression of human hands.” In Louisiana, near the Trinity, there is a great inclosure partially faced with sun-dried bricks of large size; and in this neighborhood ditches and artificial ponds have been examined. In the Southern States these works appear to assume a closer resemblance to the mound work of Central America.