Leaving now the past, expressed by geological terms, or by periods of thousands of years, we draw near to our own tribes, near, at least, comparatively speaking, and behold, here, also, we discern evidence that an ancient culture, as marked as that which built its cities along the fertile water-courses of the Old World, had its seat on the banks of our great rivers; that here flourished in full vigor for an unknown length of time a people whose origin and fate are yet in doubt, though, thanks to the combined efforts of many able men, we begin to have clearer ideas of their social organization. We know them only by reason of their remains, and as these principally are mounds, we call them the “Mound Builders.” The name is not a distinguishing one in every sense, since mankind, the world over, have been mound and pyramid builders. The pyramids of Egypt and the mound-dotted surface of Europe and Asia bear testimony to this saying, yet nowhere else in the world are they more plainly divided into classes, or marked with design than here. In some places fortified hills and eminences suggest the citadel of a tribe or people. Again, embankments of earth, mostly circular or square, separate and in combination, generally inclosing one or more mounds, excite our curiosity, but fail to satisfy it. Are these fading embankments the boundaries of sacred inclosures, or the fortification of a camp, or the foundations on which to build communal houses? Here graded ways, there parallel embankments raise questions, but suggest no positive answer. We are equally in doubt as to the purposes for which many of the mounds were built. Some seem to have been used as places of sepulcher, some for religious rites, and others as foundation site of buildings. Some may have been used as signal mounds, from which warning columns of smoke, or flaming fires, gave notice of an enemy’s approach. Before coming to details let us, at a glance, examine the picture as a whole. This country of ours, with its wide plains, its flowing rivers and great lakes, is said by scholars to have been the home of a people well advanced in the arts of barbarian life. What connection, if any, existed between them and the Indians, is yet unsettled. We are certain that many years before the Spanish discovery of America they made their settlements here, developed their religious ideas, and erected their singular monuments. That they were not unacquainted with war, is shown by their numerous fortified inclosures. They possessed the elements of agriculture, and we doubt not were happy and contented in their homes. We are certain they held possession of the fairer portions of this country for many years.