played so important a part in the commercial exchanges of nations at the dawn of history. In regions where flint or hornstone is not available, the quartzite appears to have been most commonly resorted to. I have in my possession some spear heads measuring from seven to nine inches long, which were dug up on an old Indian trail at Point Oken, lying to the north of Lake St. John, Quebec; and implements of the like material are common throughout eastern Canada. The same widely diffused material was no less freely resorted to by the tribes on the Pacific coast. The arrow heads found throughout the Salish country of southern British Columbia are chiefly formed of quartzite, though chert is also used. The quartzite occurs in so many localities that it is difficult to trace its special source. But near the east end of Marble Cañon, and at the Big Bock Slide, about six miles above Spence’s Bridge, on Thompson river, chips occur in considerable quantities, suggestive of one of the chosen localities resorted to for quarrying and manufacture. The old arrow-makers evidently derived pleasure from the selection of attractive materials for some of their choicest specimens of handiwork. The true crystalline quartz was prized for small arrow heads, some of which are equally pleasing in material, form, and delicacy of finish. But the material most usually employed in eastern Canada, as well as that previously referred to as in request by the old workers of the Ohio valley for their largest implements, is a gneissoid rock of comparatively common occurrence, which chips off with a broad facet when sharply struck, and leaves an acute edge and point. Mr. Seller’s valuable paper on the ancient workshops of Ohio and Pennsylvania also contains an account of his own experience relative to the flaking and chipping of flint implements.[36] In this communication he remarks: “Most of the arrow points found within my reach in Philadelphia, Delaware, and Chester Counties, Pennsylvania, were chipped from massive quartz, from the opaque white to semi-transparent, and occasionally transparent.” He further describes his first chance discovery of one of the native work-places. He was in company with two scientific mineralogists, when, as he writes, “we came to a place where (judging from the quantities of flakes and chips) arrow points had been made. After much diligent search, only one perfect point was found. There were many broken ones, showing the difficulty in working the material. Mr. Lukins, a scientific mineralogist, collected a quantity of the best flakes to experiment with, and, by the strokes of a light hammer, roughed out one or two very rude imitations.” Major J. H. Long traversed the continent westward to the Rocky Mountains, as head of the United States Military Topographical Department; and from him Mr. Sellers derived information of the habits of the rude western tribes long before they had been brought into direct contact with any civilised settlers.