Some years ago, Mr. Pigeon, of Virginia, made drawings of a number of these, and he stated that near the junction of the St. Peter's with the Mississippi River were a large number of mounds and monuments, consisting--1st, of a circle and square in combination, as at Circleville, in Ohio, the sole difference being a large truncated mound in the centre of the square, as well as in the centre of the circle, with a platform round its base; 2nd, near by, the effigy of a gigantic animal resembling the elk, in length one hundred and ninety-five feet; 3rd, in the same vicinity, a large conical mound, three hundred feet in diameter at the base, and thirty feet in height, its summit covered with charcoal. This mound was surrounded by one hundred and twenty smaller mounds, disposed in the form of a circle. Twelve miles to the westward of these, and within sight of them, was a large conical truncated mound, sixty feet in diameter at the bottom, and eighteen feet high, built upon a raised platform or bottom. It was surrounded by a circle three hundred and sixty-five feet in circumference. Entwined around this circle, in a triple coil, was an embankment, in the form of a serpent, two thousand three hundred and ten feet in length. This embankment, at the centre of the body, was eighteen feet in diameter, but diminished towards the head and tail in just proportion. The elevation of the head was four feet, of the body six feet, of the tail two feet. The central mound was capped with blue clay, beneath which was sand mixed with charcoal and ashes. Mounds arranged in serpentine form have also been found in Iowa, at a place formerly known as Prairie La Porte, afterwards called Gottenburgh. Also at a place seven miles north of these on Turkey River, where the range was two and a half miles long, the mounds occurring at regular intervals. Twenty miles to the westward of this locality was the effigy of a great serpent with that of a tortoise in front of its mouth. This structure was found to be one thousand and four feet long, eighteen feet broad at its widest part, and six feet high; the tortoise was eighteen by twelve feet. Mr. Pigeon gave accounts of many other structures, tending to illustrate and confirm the opinions advanced respecting the religious and symbolical character and design of many, if not all, the more regular earth-works of the Western States. Thirty miles west of Prairie Du Chien, he found a circle enclosing a pentagon, which in its turn enclosed another circle, within which was a conical truncated mound. The outer circle was twelve hundred feet in circumference, the embankment twelve feet broad and from three to five feet high. The entrance was on the east. The mound was thirty-six feet in diameter by twelve feet high. Its summit was composed of white pipe-clay, beneath which was found a large quantity of mica in sheets. It exhibited abundant traces of fire.