Page:Popular Science Monthly Volume 43.djvu/685

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PREHISTORIC JASPER MINES.

There the quarryman's work seems to have stopped, if it always went so far, and the hoard of blank blades ready to be finished or specialized by some local arrowhead maker into perforators, arrowheads, spears, or knives, as the case may be, is carried away. When for a time its owner is compelled to part company with it, he buries it in the ground for safe keeping or to render the material softer for future work,[1] and there for a dozen reasons

PSM V43 D685 Hammer stones and blocked out blades from jasper mines.jpg
Fig. 5 (about 14).—Hammer Stones and Blocked-out Blades. Jasper Mines, Macungie, Pa.

it may remain for long years, to be discovered at last by a surprised plowman.

Such a cache of hitherto "inexplicable" leaf-shape implements, consisting of one hundred and sixteen yellowish argillite blades,


  1. But the flint "knappers" at Mr. Robert Snares's gun-flint works at Brandon, Suffolk, England, told me that they always dried the nodules by the fire or in the wind, as the hammers would not "take hold" of flint wet from the mines. Argillite, on the other hand, so say the quarry men at Point Pleasant on the Delaware, flakes better when wet, as, in my experience at Macungie, jasper does also.