Another writer says: "It is related by intelligent Indian traders that a custom once prevailed among certain tribes, on the burial of a chief or brave of distinction, to consider his grave as entitled to the tribute of a portion of earth from each passer-by, which the traveler sedulously carried with him on his journey. Hence the first grave formed a nucleus around which, in the accumulation of the accustomed tributes thus paid, a mound was soon formed." [Footnote: Smith's History of Wisconsin, vol. 3, 1834, p. 245.] The same author says [Footnote: Ibid., p. 262.] the tumulus at the Great Butte des Morts (Great Hill of the Dead) was raised over the bones of Outagami (Fox Indian) warriors slain in battle with the French in 1706. According to a Winnebago tradition, mounds in certain localities in Wisconsin were built by that tribe, and others by the Sacs and Foxes.[Footnote: Wis. Hist. Soc., Rept. I, pp. 88, 89.] There is another Indian tradition, apparently founded on fact, that the Essex mounds in Clinton County, Mich., are the burying places of those killed in a battle between the Chippewas and Pottawatomies, which occurred not many generations ago. [Footnote: Smithsonian Report, part 1, 1884, p. 848.] CHAPTER II. SIMILARITY OF THE ARTS AND CUSTOMS OF THE MOUND BUILDERS TO THOSE OF INDIANS. The historical evidence is, as we have seen, conclusive that some of the tribes of Indians were mound builders. The explorations by the Bureau of Ethnology in the South and West have also brought to light so many corroborative facts that the question may be considered settled. These will shortly be given to the public; only a few can be noticed here, and that in a very brief and general way. As the country was inhabited only by Indians at the time of its discovery, and as we have no evidence, unless derived from the mounds, of its having ever been occupied by any other people, every fact indicating a similarity between the arts, customs, and social life of the mound-builders and those of the red Indians, is an evidence of the identity of the two peoples. The greater the number of these resemblances, the greater the probability of the correctness of the theory, so long as we find nothing irreconcilable with it. Architecture.--One of the first circumstances which strike the mind of the archaeologist who carefully studies these works as being very significant, is the entire absence of any evidence in them of architectural knowledge and skill approaching that exhibited by the ruins of Mexico and Central America, or even equaling that exhibited by the Pueblo Indians.