common in these ancient works, and the figures are always perfect. This perfection of the figures proves, as Squier and Davis remark, that "the builders possessed a standard of measurement, and had a means of determining angles."

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 embank

ments.

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.

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.

The result of intelligent exploration and study of these antiquities is stated as follows: "Although possessing throughout certain general points of resemblance going to establish a kindred origin, these works nevertheless resolve themselves into three grand geographical divisions, which present in many respects striking contrasts, yet so gradually merge into each other that it is impossible to determine where one series terminates and another begins." On the upper lakes, and to a certain extent in Michigan, Iowa, and Missouri, but particularly in Wisconsin, the outlines of the inclosures (elsewhere more regular in form) were designed in the forms of animals, birds, serpents, and even men, appearing on the surface of the country like huge relievos. The embankment of an irregular inclosure in Adams County, Ohio, is de

scribed as follows by Squier and Davis, Mr. Squier having made the drawing of it for the work published by the Smithsonian Institution:

"It is in the form of a serpent, upward of 1000 feet in length, extended in graceful curves, and terminating in a triple coil at the tail. The embankment constituting this figure is more than 5 feet high, with a base 30 feet wide at the centre of the body, diminishing somewhat toward the head and tail. The neck of the figure is stretched out and slightly curved. The mouth is wide open, and seems in the act of swallowing or ejecting an oval figure which rests partly within the distended jaws. This oval is formed by an embankment 4 feet high, and is perfectly regular in outline, its transverse and conjugate diameters being respectively 160 and 80 feet. The combined figure has been regarded as a symbolical illustration of the Oriental cosmological idea of the serpent and the egg; but, however this may be, little doubt can exist of the symbolical character of the monument."

Figure 9 gives a view of this work.

No symbolic device is more common among the antiquities of Mexico and Central America than the form of the serpent, and it was sometimes reproduced in part in architectural constructions. One of the old books, giving account of a temple dedicated to Quetzalcohuatl, says, "It was circular in form, and the entrance represented the mouth of a serpent, opened in a frightful manner, and extremely terrifying to those who approached it for the first time."

On the Ohio and its tributaries, and farther south,