EXPLANATION OF PLATE 57, 



Flint Flakes Chipped on One Edge, Intended for Knives. 



Fig. 1. Gkayish Flint. 



(Cat. No. 29U24, U.S.N.M. Miliiersville, (liieriisey County, Ohio.) 



Fig. 2. Gray Jaspery Flint. 



(Cat. No. 98089, U.S.N. M. Kentucky. W. M. Linney.) 



Fig. 3. Yellow Ja.sper. 



(Cat. No. 7050, U.S.N.M. Union County. Kentucky. S. S. Lyon.) 



Fig. 4. Pale-Gray Flint. 



(Cat. No. 32421. U.S.N.M. Lick deck. Orange County, Indiana. ¥. M. Symmes.) 



