While Linn county and Iowa have not as many mounds of as much interest as, for example, the Circle Mound in Ohio, still there are a number of mounds found in eastern Iowa and a number in Linn county which would appear to have been constructed by Mound Builders, or, at least, by some pre-historic race long since extinct. Some mounds found near Palo would indicate that they must have been constructed a long time ago, for even trees of large dimensions have been found growing on top and around these mounds. The remnants certainly give evidence in places as though they had been constructed for religious purposes, which evidently is true of nearly all such remnants which have recently been discovered in Yucatan and Mexico. Some stone implements and ornaments have been found in some of these mounds. These implements are all flint spear and arrow heads and have been worked with much care and skill. Some pottery has also been discovered, at times ornamented and at other times very coarse. Some copper implements have been found of a kind and quality as discovered in the copper region of Lake Superior, which, undoubtedly, have been worked by the Indians and perhaps by the Mound Builders. No bones have so far been discovered to indicate that the Mound Builders had the use of any domestic animals. Very seldom have human skeletons been found, which might attest to the fact that these had been dug ages and ages ago. No tablets of any kind have been discovered, which might indicate that the Mound Builders had at no time a written language. Science has held that the Mound Builders were an agricultural people and compared with the Indians much more civilized, and that the Mississippi valley was densely populated until the arrival of the Indians. Whether the Indians exterminated them or they were driven away, or they voluntarily removed from this part of the country is still a debatable question. "If it is really true that there were pre-historic peoples, then the oldest continent would be, in all probability, the first inhabited; and as this is the oldest continent in the formations of the geological period, and as there are found relics of man in England in identically the same strata as are shown in Linn county, why may we not reasonably expect to find relics of man--relics as old as any--in Linn county? If man once existed here, why may he not have always existed here? It is certainly unreasonable to think young Europe should alone have early relics of man.