EXPLANATION OF PLATE 25. 



Figs. 1-3. Obsidian Cores. 



(Cat. Kos. 98772, 98771, 98768, U.S.N.M. Oholula, Mexico. W. W. Blake.) 



Fig. 4. Obsidian Coke. 



(Cat. Xo. 1049, U.S.X.M. Mouud near Vera Cruz, Mexico. Lieutenant Van Wvck, 



U.S.X.) 



Figs. 5, 6. Obsidian Cores. 



(Cat. Nos. 98776, 98769, U.S.N.M. Mexico. W. TV. Blake.) 



Figs. 7, 8. Small Flakes of Obsidian. 



(Cat. ICo. 20025, U.S.N.M. Mounds near Cordova. Mexico. Dr. Hugo Finrk.) 



Fig. 9. Leaf-shaped Implement of Obsidian. 



(Cat. No. 139397, F.S.N.IiL Klamath Indian Koservation, Oregon. C. K. Smith.) 



Fig. 10. Leaf-shaped Implement of Obsidian (broken). 



(Cat. No. 9347, U.S.N.M. Cordova, Mexico. Dr. Hugo Finck.) 



Fig. 11. Worked Flake of Obsidian (scraper?). 



(Cat. No. 98765, U.S.N.M. Mexico. W.W.Blake.) 



Figs. 12-15. Flakes of Obsidian. 



(Cat. No. 9359, U.S.N.M. Cordova, Mexico. Dr. Hugo Finck.) 



Fig. 16. Arrowpoint of Obsidian. 



(Cat. No. 98777. U.S.N.M. lilexlco. W. W. Blake.) 



Fig. 17. Arrowpoint of Obsidian. 



(Cat. No. 9355, U.S.N.il. Cordova, Mexico. Dr. Hugo Finck.) 



Fig. 18. Arrowpoint of Obsidian. 



(Cat. No. 98702, U.S.N.M. Tezcuco, Mexico. W.W.Blake.) 



Figs. 19, 20. Ahkowpoints of Obsidian. 



(Cat. Nos. 9354, 9353, U.S.N.M. Cordova, Mexico. Dr. Hugo Finck.) 



Fig. 21. Leaf-shaped Implement of Obsidian. 



(Cat. No. 9352, U.S.N.M. Cordova, Mexico. Dr. Hugo Finck.) 



Fig. 22. Aruowpoint of Obsidian. 



(Cat. No. 139398, U.S.N.M. Klamath Indian Reservation, Oregon. C. K. Smith.) 



Figs. 23, 24. Arrowpoints of Obsidian. 



(Cat. No.s. 98781. 98786, U.S.N.M. Mexico. W.W.Blake.) 



Figs. 25-27. Obsidian Arrowpoints. 



(Cat. No. 149391, U.S.N.M. Buttes, 4 miles west of Upper Gallinus, New Mexii-o. Lieut. 

 G.M. Wheeler.) 



Fig. 28. Leaf-shaped Implement of Obsidian. 



(Cat. No. 148127, U.S.N.M. "Equus beds " near Silver Lake, Oregon. Prof. E. D. Cope.) 



Fig. 29. Worked Flake of Obsidian. 



(Cat. No. 35176. U.S.N.M. Island of Crete. G. L. Feuardeut.) 



Fig. 30. Obsidian Core. 



(Cat. No. 35169. U.S.N.M. Island of Crete. G. L. Feuardent.) 



Fig. 31. Flint Core. 



((Jat. No. 100953, U.S.N.M. Lund, Sweden. Thomas Wilson.) 



