6 7 o THE POPULAR SCIENCE MONTHLY. 



Turning back to the quarries and refuse heaps, and passing by 

 the many problems of deep archseological interest that they sug- 

 gest, suffice it here to say that for one fact already mentioned 

 they claim attention among the foremost fields of American re- 

 search. 



Here, at a distance of from forty to fifty miles from Trenton, 

 are scores of jasper specimens closely resembling the forms of 

 argillite found there buried fifteen and twenty feet in the glacial 

 gravels ; imitations, so to speak, of the so-called " palgeolith," or 



FIG. 8 (T). 1, FLINT PAL^OLITH FROM ST. ACHEUL, FRANCE ; 2, 3, 4, 5, TI-RTLEBACKS OF 

 ARGILLITE, DELAWARE VALLEY. (Found on the surface.) 



implement of the savage ice man, who, seven thousand years ago, 

 chipped river pebbles on the freshet-swept banks of the Delaware. 

 We have been told that this object from Trenton, this " palseo- 

 lith," is a finished implement, a type of an epoch ; that the savage 

 who fashioned it was little better than an ape in culture, ignorant 

 even of the use of the bow, and a slayer of his prey with clubs 

 and stones. And science has willingly stolen into the by-paths of 

 wonder and speculation to suggest his origin and fate. Akin it 

 was said to the river-drift man of Europe, he crossed tne North 

 Atlantic on an isthmus that in preglacial times stretched from 

 Britain to Greenland to dwell on the cold shores of the Delaware 

 when the great glacier stretched its coping of ice from the Hud- 



