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THE POPULAR SCIENCE MONTHLY. 



we found, in 1891, on Ridges Island, on the Delaware ; another of 

 one hundred and seven of blue argillite was obtained for us by 

 Mr. Doan, at Bridge Valley, Bucks County, Pennsylvania, last 

 May, and another of nine blanks of chert was found by us in June 

 of last year, on an island in the Susquehanna ; while on the other 

 hand that the material was sometimes carried away from the mines 

 in the rough, was proved to us by the discovery of a large nodule 

 partly chipped at the village site of Upper Blacks' Eddy, on the 

 Delaware, ten miles from Durham, and another smaller mass on 

 the river shore at Fry's Run. 



The story of the Lehigh jasper quarries thus glanced at, but 

 soon to be fully and carefully studied, is thus far a corroboration 

 in main of the recent researches of Mr. W. H. Holmes at Piney 



FIG. 6 (I). CACHE BLADES. Bridge Valley, Pa. 



Branch, in the Indian Territory, and in Garland County, Arkan- 

 sas. Is it the story of all jasper quarries in the United States ? 

 Is it the story as well of the argillite sandstone and quartzite 

 quarry sites and the obsidian workings not yet discovered and 

 studied ? In a word, are we right in supposing that this process 

 of passing from the shapeless block (Fig. 7) to the " turtleback/' 

 and from the " turtleback " to the thin, leaf -shaped blank, and 

 thence to the spear or finished implement, represents the necessary 

 steps through which all peoples in an age of stone have passed in 

 the fashioning of their rock-hewn tools ? 



Thirty years ago Indians were chipping arrowheads of obsidian 

 and hornstone on the shores of the Sacramento. Many of them 

 still live in the United States and Canada who can doubtless ex- 

 plain the whole matter. Sometimes their opinion has been asked 



