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In the details of their works, and in manufactured ar. ticles taken from the mounds, there is evidence of con
For instance, it has been ascer.
They were con
inclosures are perfect circles, and 1 precision which implies a ilders that may be called
cir scientific. Figures 13, 14, 15, 16 show some of the more
the square inclosures perfect squares.
tained that the
Fig. 16.-Rectangular Work, Randolph County, wn. important works of the Mound-Builders, chiefly in Ohio. Relics of art have been dug from some of the mounds, consisting of a considerable variety of ornaments and implements, made of copper, silver, obsidian, porphyry, and greenstone, finely wrought. There are axes, single and double; adzes, chisels, drills or gravers, lance-heads, knives, bracelets, pendants, beads, and the like, made of copper. There are articles of pottery, elegantly designed and finished; ornaments made of silver, bone, mica from the Alleghanies, and shells from the Gulf of Mexico. The articles made of stone show fine workmanship; some of them are elaborately carved. Tools of some