Eastern Iowa, especially in the neighborhood of Davenport, has furnished some of the most interesting mounds that have yet been examined. Several gentlemen—especially Rev. Mr. Gass—of the Davenport Academy of Sciences have within a couple of years recovered a number of fine specimens of copper axes, nearly all wrapped in Mound-builder’s cloth. This cloth had been “preserved by the antiseptic action of the salts of copper, in all probability of the carbonates. In all specimens one thread of the warp is double or twisted, and there are about four to the one-fourth of an inch.”[26] Stone pipes of excellent workmanship carved to represent various animals were found. Pottery, copper beads in considerable numbers, mica and sea-shells (Pyrula and Cassis), one which had an internal capacity of 152 cubic inches, or five and one-half pints, were among the relics recovered. Most of the human remains were much decayed; although some, among them a skull, were preserved. The character of the Altar mound in this group is rather unusual. Within the mound hewn rectangular stones were laid upon one another with perfect regularity, so as to break joints, forming something resembling the exterior appearance of a chimney. We are not aware of any similarly shaped altar ever having been discovered in the mounds. The most remarkable discovery of all, however, was made January 10, 1877, by Rev. Mr. Gass and his assistants in one of the mounds which previously had been examined in part. Two tablets of coal slate covered with a variety of figures and hieroglyphics were found.[27] One of these, the larger, is of a most interesting character. On one side, as will be seen in the accompanying cut, a number of persons with hands joined have formed a semicircle around a mound, upon which a fire has been kindled, probably for the purpose of sacrifice, or for converting into a hardened and water-proof covering the layer of clay which may have been spread over the remains of some distinguished personage beneath. The presence of a layer of baked clay above human remains in so many Ohio mounds leads to this conjecture. The three prostrate human figures may be those of wives or servants of the deceased, to be sacrificed upon his grave, as has been the custom from the remotest times in India and among many savage tribes. The conspicuousness of the sun, moon, and stars, suggest even a sadder thought, that perhaps it may be purely a religious ceremony in which human victims are being offered to the heavenly bodies. Sabine worship, which spread throughout the entire length of the continent, is known to have been accompanied with the most horrid rites. Above the arch of the firmament are hieroglyphics which if deciphered no doubt would tell of the nature of this and other similar scenes. On the reverse side of the tablet is a rude representation of a hunting scene in which various animals, such as the buffalo cow, deer, bear, etc., etc., are figured. It has been