EXPLANATION OF PLATE 23. 



Fig. 1. Rude Flint Implement. 



(Cat. No. 139112, U.S.N.M. Prehistoric mines, Grimes Graves, Brandon, Snti'olk, Eng- 

 land. Edward Lovett.) 



Fig. 2. Flint Flake. 



(Cat. No. 139078, U.S.N.M. Prehistoric mines, Cissbury, Sussex, England. Pldward 

 Lovett.) 



Fig. 8. Worked Flake, Scraper. 



(Cat. No. 100259, U.S.N.M. Prehistoric nine, Spiennes, Belgium. Thomas Wilson.) 



Fig. 4. Rude Flint Implement. 



(Cat. No. 98346, U.S.N.M. Prehistoric mine or ([uarry, Flint Ridge, Licking (bounty, 

 Ohio. Gerard Fowke.) 



Fig. 5. Leaf-.shapei> Implement of Flint. 



(Cat. No. 59726, U.S.N.M. Mound, Pike County, Illinois. Rev. T. I). Weems.) 



Fig. 6. Leaf-shaped Implement of Flint. 



(Cat. No. 71607, U.S.N.M. Clark County, Missouri. P. W. Norris.) 



Fig. 7. Worked Flint Flake (neolithic). 



(Cat. No. 99866, U.S.N.M. Dorchester, England. Thomas Wilson.) 



Fig. 8. Fragment of Small Flint Implement. 



((Tat. No. 101058, U.S.N.M. Kitchen-Midden, Havelse, near Copenhagen, Denmark. 

 Thomas Wilson.) 



Figs. 9, 10. Worked Flint Flakes. 



(Cat. No. 100138, U.S.N.M. Cam]) Barliet, Mouy, near Paris (Seine-etOise), France, 

 Thomas Wilson.) 



Fig. 11. Flint Nucleus. 



(Cat. No. 100139, U.S.N.M. Camp Barbet, France. Thomas Wilson.) 



Figs. 12, 13, 15. Flint Scrapers. 



(Cat. Nos. 100103, 100097, 100110, U.S.N.M. Camp Barbet, France. Thomas Wilson.) 



Fig. 14. Flint Hammerstone. 



(Cat. No. 100086, U.S.N.M. Camp Barbet, France. Thomas Wilson.) 



