Perhaps we may more properly place him in a position midway between the flint and the stone ages (new-stone or Neolithic), for he no doubt was possessed of polished stone implements of a limited number and variety. Whether made by his own hands or by those of his predecessors is uncertain.[4] In thus assigning the Indian his place in the scale by which man’s state of barbarism or degree of civilization has been measured by scholars in Europe, we do not pretend to claim for him the antiquity of the man of the flint age in any other part of the globe.[5] [Illustration: Arrow Heads in the National Museum (Washington).] [Illustration: Methods Employed by Indians of Hafting Stone Weapons.] [Illustration: Indian and Mound-builder Spear-Heads.] Dr. Abbott, of New Jersey, in an extended treatment of the _Stone Age_ in his own State, has shown many evidences of the protracted occupancy of the Atlantic States by a people whose weapons resemble those of ancient man in Europe. Col. Charles Whittlesey has called attention to the discovery of Indian remains in the “Shelter Cave,” near Elyria, Ohio, and also in a cave near Louisville, Kentucky, where the conditions seemed to point to an interment as long ago as two thousand years, but the evidences both as to the remains having been those of the red man and the period of burial are too uncertain to be of any service in the construction of a theory.[6] The eras or ages which have been observed to mark the different stages of the development of pre-historic man in Europe (in the manufacture of implements and the construction of places of abode), are apparently reversed in America. The Neolithic and Bronze ages preceded the Palæolithic at least in the Mississippi Basin—not that the last inhabitants deteriorated and lost the higher arts which are well known to have been cultivated upon the same soil occupied by them, but that they were preceded by a race possessed of no inferior civilization, who were not their ancestors, but a distinct people with a capacity for progress, for the exercise of government, for the erection of magnificent architectural monuments, and possessed of a respectable knowledge of geometrical principles. The remains of this mysterious people known as the mound-builders are spread over thousands of square miles of the United States, and it is a question whether the antiquarian is more surprised at the greatness of their number than in many instances at the immensity of their proportions. The entire valley region of the Missouri, Mississippi and Ohio rivers with that of their affluents was occupied by this remarkable people—presenting us with a parallel to the ancient civilization which flourished in the earliest times on the watercourses of the old world. The geographical distribution of these mounds may be described in general terms with a view to the territory occupied by them in the United States, as central, western, and southern.