There are rude, notched chipped implements of the type shown in Fig. 172, which may not be of flint but of other materials. This one is from Mr. A. M. Brooking’s collection, Trumbull County, Nebraska. It is very like types from Pennsylvania. A large implement slightly notched in the side, found in La Jara, Colorado, is shown in Fig. 175. This is of clear chalcedony, and a very fine specimen. [Illustration: FIG. 173. (S. 1–1.) Notched flint axe, or rough implement from the collection of F. Wetherington, Paducah, Kentucky. This is of chert and may have originally been a turtleback, but was afterwards hafted in a handle. ] Mr. Dudley A. Martin of Pennsylvania has mounted a large, flint implement in a handle which I show in Fig. 176. Two specimens, one from Iowa and one from Kansas, from our Andover collection, are shown in Fig. 174, and one from Kentucky in Fig. 173. An unusually well-chipped, notched, flint axe is shown in Fig. 177. It was found by Mr. W. H. Davis near the mouth of the Muskingum River in Ohio. The types of flint celts vary. I show five ordinary ones from Mr. Mitchell’s collection, Ripon, Wisconsin, in Fig. 178, and the ten various forms of celts from the Andover collection in Fig. 180. [Illustration: FIG. 174. (S. 2–3.) Collection of Phillips Academy, Andover. One from Iowa, the other from Kansas. The edges are worn smooth and they both show considerable use. They are covered with patina and appear very old. ] [Illustration: FIG. 175. (S. 1–1.) Double-bitted war-axe, chipped out, but never polished. Dull chalcedony, tipped at each cutting edge with red. Flecked in the middle with gray spots. Luther A. Norland collection, La Jara, Colorado. ] [Illustration: FIG. 176. (S. 2–5.) Supposed method of hafting the notched flint implements. Such objects would make formidable weapons for use in close quarters. Collection of Dudley A. Martin, Duboistown, Pennsylvania. ]