6. In many parts of the Mississippi Valley, particularly in the States of Ohio and Indiana, the ancient mounds may be seen as they were at the time of the discovery of America. One of the greatest is situated in Illinois, opposite the city of St. Louis. It is elliptical in form, being about seven hundred feet in length by five hundred feet in breadth. It rises to a height of ninety feet. Another of much interest is at Grave Creek, near Wheeling, in West Virginia. A mound at Miamisburg, Ohio, is nearly seventy feet in height. One of the finest of all is the conical mound at Marietta, Ohio. Some of the mounds, as those of Wisconsin, are shaped like animals. One of the most peculiar and interesting is the great serpent mound in Adams County, Ohio. The work has the shape of a serpent more than a thousand feet in length, the body being about thirty feet broad at the surface. The mouth of the serpent is opened wide, and an object resembling a great egg lies partly within the jaws. 7. The use of the mounds has not been ascertained. Some have supposed that they were tombs in which the slain of great armies were buried, but on opening them, human remains are rarely found. Others have believed that the mounds were true memorials, intended by their magnitude to impress the beholder and transmit a memory. Still others have thought the elevations were intended for watch-towers from which the movements of the enemy might be watched and thwarted. [Sidenote: =Relics from the Mounds.=] 8. What we know of the prehistoric races has been mostly gained from an examination of their implements and utensils. These were of either stone or copper. It appears that the more advanced of the peoples, especially the nations living on the borders of the Great Lakes, were able to manufacture utensils of copper. In other parts of the country, the weapons and implements were made of flint and other varieties of stone, by chipping or polishing. The range of tools and implements was extensive, including axes, spear-heads, arrow-points, knives, chisels, hammers, rude millstones, and many varieties of earthen ware. Besides these, there were articles of ornamentation and personal use, such as pipes, bracelets, ear-rings, and beads. The common belief that the articles here referred to were the product of Indian workmanship is held by many antiquarians to be wholly erroneous. These antiquarians think that the Indians knew nothing more of the origin and production of such implements as the arrow-points, spear-heads, and stone axes than we know ourselves. [Illustration: Relics from the Mounds.]