Mounds and effigies by no means complete the description of Mound Builders’ remains. One of the most interesting and mysterious class of works is now to be described. Early travelers in Ohio came here and there upon embankments, which were found to inclose tracts of land of various sizes. It was noticed that the embankments were often of the form of perfect circles, or squares, or sometimes octagons, and very often combinations of these figures. It was further evident that the builders sought level, fertile lands, along the various river courses. They very seldom built them on undulating or broken ground. Often have the very places where civilized man has laid the foundation of his towns proved to be the sites of these ancient works of the Mound Builders, and thus it has happened that many of the most interesting works of antiquity have been ruthlessly removed to make way for the crowded streets and busy marts of our own times. The larger number of inclosures are circular, often of a small size. Where they occur separately they either have no gateway, or but one. Sometimes the circles are of very large size, surrounding many acres. Sometimes, though not very often, a ditch was also dug inside the embankment. This last circumstance is by many regarded as a strong proof that the primary object of these circles was not for defense.59 But an inclosure of this kind, even with the ditch on the inside, if surmounted by a row of pickets or palisades, would prove a strong position against Indian foes armed with bow and arrow. The Mandans constructed defenses of this kind around their villages.60 As to the original height of the walls, in the majority of cases it was not very great, generally from three to seven feet. It is estimated that in Ohio alone there are fifteen hundred inclosures, but a large number of them have nothing especially worthy of mention. Some, however, are on such a large scale that they call from all more than a passing glance. In contemplating them, we feel ourselves confronted by a mystery that we can not explain. The ruins of the old world excite in us the liveliest feeling of interest, but we know their object, their builders, and their probable antiquity. The mazy ruins at Newark, and other places in Ohio, also fill the mind with astonishment, but in this case we are not certain of their antiquity, their builders are unknown, and we can not conjecture with any degree of certainty as to their use. Before so many uncertainties imagination runs riot, and we are inclined to picture to ourselves a scene of barbaric power and magnificence. High Bank Works.