INTER-GLACIAL AMERICAN MAN. 565 



from one to twenty tons. Intermingled with those there are indeed 

 fractnred angular pebbles, some of the partially ground and polished 

 surfaces of which may, as Dr. Abbott conceives, be the defacing 

 results of later trituration on what were originally rudely chipped 

 implements of the same class ; but as a rule, the angular pebbles 

 appear to be of natural formation. 



Having thus discriminated alike between ancient and modern 

 remains, and between natural and artificially chipped stones, Dr. 

 Abbott proceeds to remark that having satisfied himself that the 

 so-called " turtle back " celts, which are the most primitive form of 

 the chipped implements of the gravels, really are of artificial origin, 

 it is further noticeable that some of them are identical in shape 

 with the ordinary forms of European drift implements. Among the 

 specimens thus found, is one unquestionable spearhead-like imple- 

 ment of flint, which is not only specially selected as one of the three 

 supposed American drift implements for engraving to accompany and 

 illustrate the Report, but is adduced at the conclusion of the Report 

 as one of the strongest confirmations of the deductions from the whole 

 evidence. " Having shown," says Dr. Abbott, " as I think, that 

 the deposit examined is glacial di-ift ; and that the stone implements 

 foiind therein could not have reached their present position at any 

 time subsequent to the formation of their deposit; and having placed 

 beyond douht, I think, the question as to whether these rudely chipped 

 stones be of artificial origin or not, by the discovery of an unques- 

 tionable spear-point (fig. 3) associated with them, I am led to conclude 

 that the rude implements found in the gravel were fashioned by man 

 during the glacial period, and were deposited with the associated 

 gravels as we now find them." To this flint spear-head I shall 

 accordingly refer with such care as the significance thus attached to 

 its discovery requires. 



Professor Shaler states that specimens of the chipped implements 

 of stone are found in great plenty along the escarpments facing the 

 Delaware. On one of his visits a search of three hours was rewarded 

 with two examples of the most artificial character, in a locality pre- 

 viously carefully explored by Dr. Abbott. But he adds : " All that 

 I have seen, with a single exception, both of the perfectly and the 

 imperfectly chipped fragments, are made of a curious granular argil- 

 lite, the like of which I do not know in place." 



Bearing the above facts in remembrance, the exceptional character 

 of the spear-like implement of flint above noted is specially worthy 



