1888.] J. Wood-Mason — The Prehistoric Antiquities of Baoichi. 393 



Fig. 1, PI. V is of black chert with the original brown crust re- 

 maining on one side and on the butt end ; its hollow cutting edge and its 

 angles are extremely sharp. 



Fig. 4 is a pretty little specimen in green chert. 



Fig. 3 of slightly translucent black chert, with the original grey- 

 crusted surface of the parent stone remaining on the triangular facet 

 which slopes to the cutting edge, has it angles obliquely and symmetri- 

 cally cut off. 



Of the four specimens which are here figured and described as 

 arrows of the chisel-edged type, Fig. 2 is the most interesting from the 

 presence of lateral notches for the reception of ligaments rendering it, to 

 say the least, in the highest degree probable that the specimen is a veri- 

 table arrow-head of the chisel-edged type and enabling one to feel more 

 sure that the nature of the three specimens that possess no notches has 

 been correctly interpreted. It is of opaque reddish yellow chalcedony 

 weathered white and become strongly adherent to the tongue by long 

 exposure to the action of water containing carbonic anhydride in solution, 

 b}^ which a soluble constituent of the stone has been removed from the 

 surface and a chalky substance greedy of moisture left behind.* In this 

 case both the notches have been made from the same side, but in the 

 cases of Figs. 2 and 5 of PI. IV, from opposite sides, of the stone, op- 

 posite faces of the arrow in the latter and the same face in the former 

 sloping to the bottom of the notches ; this difference is, as I find by 

 experiment, explained by the worker having turned the stone over for the 

 purpose of making the second notch in the latter, but not in the 

 former. I have also found that similar notches can readily be made 

 by pressing such a flake as that represented in Fig. 10 of PI. IV with a 

 grating movement hard upon another of the same substance, and that 

 the active flake becomes similarly abraded grey in the process. 



In the four preceding figures (a.) refers to the inner or core face, 

 and (h.) to the outer or worked face of the arrow-head. 



Fig. 5, of very fine grained and compact pale grey vitreous quartzite, 

 has been worked at the base in a manner similar to Fig. 2 of PI. IV, 

 and is, I am inclined to think, an arrow-head of the same type which 

 has become a chisel-edged one by the accidental loss of its point at a 

 joint in the stone. 



A form of worked flake which is, I think, of too frequent occur- 

 rence to be accidental merits a brief notice. It may be described as a 

 broad and short crescent-like sharp wedge from 21 to 35 millems. in 



* The (o) and the (iS) silica of Berzelius, the one white and insoluble, the other 

 transparent homy and soluble in water. Evans, op. cit. p. 450. 



51 



