FIG. 711. (S. 1–1.) Slate knife in handle. B. W. Arnold’s collection, Albany, New York. ] [Illustration: FIG. 712. (S. 2–3.) Sinew stone found near New Berlin, New York, on the surface. Collection of Henry W. Bagg, New Berlin, New York. ] [Illustration: FIG. 713. (S. 1–3.) Cup-stone from the Mohawk Valley, western New York. Phillips Academy collection. ] [Illustration: FIG. 714. (S. 1–4.) Stone corn-sheller(?); made of gray quartzite. The plane surface is eight by fifteen inches. Shows fractures on nearly all sides, as though it had been much larger. The corrugations have a sharp, cutting-like edge. Found in a creek in Kansas. Collection of the Historical Department of Iowa. ] [Illustration: FIG. 715. (S. 1–6.) A stone, with square hole (for unknown purpose), a sandal last, and a stone sword from the Chaco Group. Phillips Academy collection. ] [Illustration: FIG. 716. (S. 1–2.) Cup-stone. Collection of Logan Museum, Beloit, Wisconsin. ] On such a stone as is illustrated fifteen nuts could be placed at one time and crushed by a single blow of a heavy, flat slab. If they used cup-stones for this purpose, they would naturally employ stones in which there were many cups rather than the average stones containing one or two cups. If so used, the work proceeded rapidly; one person crushing and two others placing the nuts in position. As the stone weighs no more than six or seven pounds, it could be quickly raised and the contents dumped into a receptacle. [Illustration: FIG. 717. (S. 1–2.) Skull from a Florida shell heap. (See page 351.) Peabody Museum collection, Cambridge, Massachusetts. ] [Illustration: FIG. 718. (S. 1–1.) Grooved stone axe from Allington, Washington County, Wisconsin. Collection of the Milwaukee Public Museum. ] [Illustration: FIG. 719. (S. 1–5.) A group of bird-stones, boat-shaped objects and other problematical forms. J. T. Reeder’s collection, Houghton, Michigan. ] [Illustration: FIG. 720. (S. 2–3.) Problematical forms from near Burlington, Vermont. Collection of G. H. Perkins. ] [Illustration: FIG. 720 _A_. (S. 1–4.) A group of mound pipes. L. W. Hills collection, Fort Wayne, Indiana. ]