There is another still stronger argument in favor of their antiquity, viz., the decayed condition of the skeletons. The skeletons of the oldest Indian tribes are comparatively sound while those of the Mound-builders are much decayed. If they are sound when brought out, they at once begin to disintegrate in the atmosphere, which is a sure sign of their antiquity. We know that some skeletons in Europe have lately been exhumed, which, though buried more than 1,000 years, are comparatively firm and well-preserved. We are, I think, bound to ascribe a greater antiquity to the Mound-builders' skeletons than to those found in the ancient barrows of Europe. Other considerations, such as stream encroachment, and river-terrace formation, might also be brought in as presumptive arguments in favor of their great antiquity. ORIGIN OF THE MOUND-BUILDERS.--This is a question not easily answered. It brings me into no discredit before the educated world to acknowledge ignorance on this mysterious point. The study of Craniology and Philology, in connection with Ethnology, shall alone throw light on this subject. Dr. Wilson says, in his "Prehistoric Man" (p. 123), "The ethnical classification of this strange race is still an unsettled question," and he declares without fear of contradiction, "that especially concerning the Scioto Mound skull, the elevation and breadth of the frontal bone, differs essentially from the Indian, and that the cerebral development was more in accordance with the character of that singular people, who without architecture have perpetuated, in mere structures of earth, the evidences of geometric skill, a definite means of determining angles, a fixed standard of measurement, and the capacity as well as the practice of repeating geometrically constructed works of large and uniform dimensions." Undoubtedly they were skilled in agriculture, from the remains of ancient garden-beds, which were cultivated in a methodical manner. The modern Indians give no such evidence of labor. For wherever they are found they love to roam in undisputed possession of the forest, and lead an indolent life. Of course I do not assign this as a valid reason for their not being identified with the Mound-builders. An ancient race may have a degenerate offspring. Nor shall I attempt to find in the various inscriptions any clue to their Hebrew origin, or to identify that ancient people with the lost tribes, as some have dared to do. Foster inclines to regard them as emigrating from the tropics, rather than coming from the north.