[♠] XLVI.

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CHAPTER XI. IMPLEMENTS OF METAL.

The first inquiry suggested by an inspection of the mounds and other earthworks of the West, relates to the means at the command of the builders in constructing them. However numerous we may suppose the ancient people to have been, we must regard these works as entirely beyond their capabilities, unless they had some artificial aids. As an agricultural people, they must have possessed some means of clearing the land of forests and of tilling the soil. We can hardly conceive, at this day, how these operations could be performed without the aid of iron; yet we know that the Peruvians and Mexicans, whose monuments emulate the proudest of the old world, were wholly unacquainted with the uses of that metal, and constructed their edifices and carried on their agricultural operations with implements of wood, stone, and copper. They possessed the secret of hardening the metal last named, so as to make it subserve most of the uses to which iron is applied. Of it they made axes, chisels, and knives.

The mound-builders were acquainted with several of the metals, although they do not seem to have possessed the art of reducing them from the ores. Implements and ornaments of copper are found in considerable abundance among their remains; silver is occasionally found in the form of ornaments, but only to a trifling amount; the ore of lead, galena, has been discovered in considerable quantities, but none of the metal has been found under such circumstances as to establish conclusively that they were acquainted with the art of smelting it. No iron or traces of iron, except with the recent deposits, have been discovered; nor is it believed that the race of the mounds had any knowledge of that metal. The copper and silver found in the mounds were doubtless obtained in their native state, and afterwards worked without the intervention of fire. The locality from which they were derived seems pretty clearly indicated by the peculiar mechanico-chemical combination existing, in some specimens, between the silver and copper, which combination characterizes only the native masses of Lake Superior. In none of the articles found is there evidence of welding, nor do any of them appear to have been cast in moulds. On the contrary, they seem to have been hammered out of rude masses, and gradually and with great labor brought into the required shape. The lamination, resulting from hammering the baser metals while cold, is to be observed in nearly all the articles. But, notwithstanding the disadvantages which they labored under, the mound-builders contrived to produce some very creditable specimens of workmanship, displaying both taste and skill.

No articles composed entirely of silver have been discovered: the extreme scarcity of that metal seems to have led to the utmost economy in its use. It is p197 only found reduced to great thinness, and plated upon copper. By plated, it should not be understood that any chemical combination, or a union produced by heat, exists between the two metals, but simply that thin slips of silver were wrapped closely around the copper, their edges overlapping, so as to leave no portion exposed. This was done so neatly as, in many cases, almost to escape detection.

Fig. 81. AXES.—Among the implements recovered from the mounds, are several copper axes, the general form of which is well exhibited in the engravings herewith presented. They are well wrought, and each appears to have been made from a single piece,—showing that the metal was obtained in considerable masses. The largest of these, Fig. 81, weighs two pounds five ounces. It measures seven inches in length, by four in breadth at the cutting edge, and has an average thickness of about four tenths of an inch. Its edge is slightly curved, somewhat after the manner of the axes of the present day, and is bevelled from both surfaces.