12 ILLUSTRATIONS [kth. axn. 15 



Pago 



Figure II. Flaking bv pressure 81 



15. Klakini; by pressiirn 81 



16. Probable manuer of liaftiiig the smaller chisels 112 



17. Probable manner of hafting the 8ingle-i>ointe(l and the two- 



chisels or picks 113 



18. Sketch mai) of the Clifton quarry 115 



19. Rude pick of quartz, slightly sharpened by Haking (i actual size). 120 



20. Kuile pick of quartz, slightly sharpened by Haking (i actual size). 121 



21. Kude pick made by sharpening ([luirtzite bowlder (J actual size).. 121 



22. Rude pick made by sharpening quartzite bowlder (i actual size).. 122 



23. Implement used in cutting steatite; from quarry in Howard 



county, Maryland (i actual size) 127 



24. Implement used in cutting steatite; from quarry in Howard 



county, Maryland (S actual size) 128 



25. Implement used in cutting steatite; from the OIney fjuarry (i ac- 



tual size) 129 



26. Implement used In cutting steatite; from Sandyspring <|uarry 



( i actual size) 130 



27. Gouge-like implement grooved for hafting ( J actual size) 131 



28. Map showing distribution of rejects of manufacture 138 



29. Map showing distribution of implements 139 



29a. Cross section illustrating successive removal of flakes from 



bowlders 152 



