AUSTRALASIAN AND OTHER STONE IMPLEMENTS. 233 



I do not consider it necessary to describe the specimens minutely, 

 as I trust that the figures will give sufficiently correct idea of their 

 shapes and sizes. 



Professor David kindly assisted me in identifying the rocks of 

 which they are composed, and I am particularly indebted to him 

 for his assistance in the case of Nos.9, 10, 11, 12, and 13, from 

 Bondi, i.e., those composed of a spotted altered clay stone, which 

 he recognised as being the same material as that of some imple- 

 ments from Vegetable Creek, described by him in the Journal of 

 the Linnean Society of N. S. Wales. 



Wherever necessary, chips were taken from the implements 

 and converted into slides and examined under the microscope. 



The pebbles of spotted altered claystone, from which many of 

 the weapons have been made, were probably brought from the old 

 river bed cut through by the road and railway at Lapstone Hill, 

 Emu Plains ; the source of this rock is not known. 



The minute pits in the surfaces of the older implements made 

 of the spotted altered claystone, are evidently caused by the 

 removal of the "spots" by weathering. The weathering and 

 pitting on some of the weapons indicate considerable antiquity, 

 a,nd especially where such weathering exists on the cutting edge. 

 The effects of wear are quite different, and they cannot be mistaken 

 for those of weathering. 



In some cases the implements, e.g., No. 8, {Plate 13.) have 

 evidently been etched or corroded by wind borne sand. 



Nos. 24 and 25 (Plate 33.) serve to show the method of mount- 

 ing the weapons in vines, which is much the same as that used by 

 blacksmiths at the present day for mounting or holding chisels 

 and punches. 



I do not give references to the literature of the subject, as the 

 recent publications by Mr. R. Etheridge, Jun., in the Memoirs of 

 the Geological Survey of New South Wales, the Linnean Society 

 of New South Wales, and elsewhere, render it unnecessary for 

 me to do so here. 



