p. 131

140

Mineralogy

Native Copper. Fragments of native [copper] (or pure) copper have been often found in various parts of the Territory. A mass weighing [about or] over one hundred pounds is said to have been found at Green Bay- Mr. G. Trowbridge found on his farm near Milwaukee a piece weighing thirty pounds [which is said to have been attached to fragments of a very course grained granite consisting of large crystals of gray feldspar with very little admixture of quartz and mika]. -Three specimens were found in excavating the canal in Milwaukee in a gravel bank some ten or [fifteen] twelve feet below the surface of the ground, which together weighed about twenty pounds. One of these is now safely deposited in the Cabinet of Yale College at New Haven. Numerous smaller specimens are occasionally found at Milwaukee, Racine, and other places. These fragments of copper have evidently been transported from their native beds, probably at Lake Superior, with the boulders of primitive and trappeau rocks, and by the same cause. They are therefore not to be

79

140

Mineralogy

Native Copper. Fragments of native [copper] (or pure) copper have been often found in various parts of the Territory. A mass weighing [about or] over one hundred pounds is said to have been found at Green Bay- Mr. G. Trowbridge found on his farm near Milwaukee a piece weighing thirty pounds [which is said to have been attached to fragments of a very course grained granite consisting of large crystals of gray feldspar with very little admixture of quartz and mika]. -Three specimens were found in excavating the canal in Milwaukee in a gravel bank some ten or [fifteen] twelve feet below the surface of the ground, which together weighed about twenty pounds. One of these is now safely deposited in the Cabinet of Yale College at New Haven. Numerous smaller specimens are occasionally found at Milwaukee, Racine, and other places. These fragments of copper have evidently been transported from their native beds, probably at Lake Superior, with the boulders of primitive and trappeau rocks, and by the same cause. They are therefore not to be

79