fifty-two years of the Aztec cycle, are also absent on the Mississippi stone.”[48] The serpent-symbol appears to have played its part among the Mound-builders, as well as in Mexico and Central America. The great serpent of Adams County, Ohio, is the most extensive delineation of the all-important symbol on the continent. Out of eighteen engraved circular plates made of the shell of the Pyrula and taken from Brakebill and Lick Creek Mounds in East Tennessee (and now deposited in the Peabody Museum of Archæology) thirteen bear the device of a rattlesnake. In one of the mounds of “Mound City,” Ross County, Ohio, several small tablets representing the rattlesnake were unearthed, while other mounds in the same locality yielded pipes bearing the same representation.[49] [Illustration: Jar from Child’s Grave (Tennessee). (Prof. Putnam’s Exploration.)] [Illustration: Works in Washington County, Miss.] [Illustration: Aboriginal Shuttle-like Tablets. (Nat. Mus.) Surface Finds.] On the Southern Mississippi, in the area embraced between the termination of the Cumberland Mountains near Florence and Tuscumbia in Alabama and the mouth of Big Black River, this people left numerous works, many of which were of a remarkable character.[50] The whole region bordering on the tributaries of the Tombigbee, the country through which the Wolf River flows and that watered by the Yazoo River and its affluents, was densely populated by the same people who built mounds in the Ohio Valley. Mr. Fontaine describes the mounds of this region and of the Tennessee River Valley as being most frequently of the truncated pyramidal type, and refers to one (seen by him in 1847) seventy feet high, covering an acre of ground. It is remarkable that the entire valley of the great river from Cairo to the mouth of Pointe à la Hache, fifty miles below New Orleans, is thickly studded with mounds.[51] As at Cahokia the Monarch Mound occupied a space equal to six acres, so at Seltzertown, Mississippi, we have another immense mound covering nearly the same area. Its dimensions are: length, about six hundred feet; breadth, four hundred feet at the base; height, forty feet, with a summit nearly four acres in area, reached by means of a graded way. The structure lies with its greatest length nearly due east and west. Upon the platform summit are three conical mounds, one at each end and the third in the centre. The mound at the western extremity of the summit rises to a height of nearly forty feet, while the one at the opposite extreme does not fall far short of the same altitude. This would give a total height of eighty feet above the level of the base. Both of these mounds are truncated. Eight other mounds of minor proportions are observable. The most remarkable feature connected with this mound is a wall of sun-dried bricks, built two feet thick, as its support on the northern side. These were filled with grass rushes and leaves, while some of the bricks of great size used in angular