"Dr. Patrick has stated that the area of the base is over fifteen acres. This base is larger than that of the Great Pyramid, which was counted as one of the seven wonders of the world, and we must not lose sight of the fact that the earth for its construction was scraped up and brought thither without the aid of metallic tools or beasts of burden, and yet the earth was obtained somewhere and piled up over an area of fifteen acres, in one place to a height of one hundred feet, and even the lowest platform is fifty feet above the plain. Some have suggested that it might be partly a natural elevation. There seems to be, however, no good reasons for such suggestions. "Near the site of Hughes High School in Cincinnati stood this prehistoric earthwork. It was originally more than thirty-five feet high, but was entirely levelled in 1841." (footnote Chas. A. Jones.) The first platform is reached at the height of about fifty feet. This platform has an area of not far from two and four-fifths acres-large enough for quite a number of houses, if such was the purpose for which this mound was erected. The second platform is reached at about the height of seventy-five feet, and contains about one and three-fourths acres. The third platform is elevated ninety-six or ninety-seven feet, while the last one is not far from one hundred feet above the plain. We require to dwell on these facts a moment before we realize what a stupendous piece of work this is. Why need we go to Egypt to see the Great Pyramid when we know who built it and for what it was used; while we have this great work in our own country by a vanished race whose purpose in erecting it is still unknown? Some writers think that this huge piece of work was performed so that their tribe would have an elevation upon which to place their village, as an elevated site has always been an important factor in defenses. Other writers consider it a temple mound, and it resembles those that the ancient Mexicans raised for both religions purposes and town sites. Others believe that it may have been used to elevate their homes above the level valley in case of floods. At Miamisburg we have a great mound, rising to a height of sixty- eight feet, which is regarded as one of a chain by which signals were transmitted along the valley. In the Scioto valley, from Columbus to Chillicothe, a distance of about forty miles, twenty mounds may be selected, so placed in respect to each other that it is believed if the country was cleared of forests, signals of fire might be transmitted in a few minutes along the whole line. They may have been used as signal stations by the red man centuries after the disappearance of their original builders.