Manchester Memoirs, Vol. Int. (1909), No. 8. 13 



re-sharpening sometimes simulate the concave form, 

 although a close inspection will allow of their being dif- 

 ferentiated. In all cases re-sharpening tends to produce 

 irregularity of outline which continued work tends to 

 smooth down. 



/Sea^/zMeftTf 7r-a*fst^rse £fovb/e 



A<o^ Gy^r/^ £n^^eis .s/fett^ Mr as mwgm 



Fig. 2. 



(49) The push planes were probably actuated in a 

 downward direction, the surface to be worked upon being 

 more or less vertical. 



(50) Class III. Scrapers. These implements are 

 usually formed from natural fragments or struck flakes 

 oval or D-shaped in form and wedge-shaped in cross 

 section. The thick edge is held in the palm of the hand 

 with the index finger extended along it, the thumb being 

 placed on the face nearest to the operator, and the remain- 

 ing fingers on the far side of the tool, while the cutting 



