GLACIAL MAN IN THE TRENTON GRAVELS. 



19 



the visitor to-day, although the bluff is now buried almost com- 

 pletely under city refuse, will hardly fail to find some rudely 

 flaked form in the deeper gullies or upon the narrow river bank 

 or beach at the base. Dr. Abbott explicitly states ^ that he 

 obtained certain of these specimens from the gravel outcrops, and 

 that they were not in talus formations, but in undisturbed deposits. 

 How then is it possible to do otherwise than accept these state- 

 ments as satisfactory and final? 



Very recently, however, fortunate circumstances have 

 brought the evidence furnished by this site again within our 



Fig. I. Sketch map of the Trenton bluff, showing the relation of the sewer trench 

 to the "implement" yielding slope. . . . a-b section line, Fig. 2. 



reach, thus enabling us to re -open the discussion under favorable 

 conditions. What I had for some time desired to do in this 

 case was, what I had already done at Piny Branch, D. C, and 

 at Little Falls, Minn., to open a trench into the face of the bluff, 

 and thus secure evidence for or against the theory of a gravel 

 man. This measure was, however, rendered impracticable by 

 the occupation of the bluff margin by a city street ; but it hap- 

 pened last summer that the city authorities, desiring to improve 

 the sanitary condition of the city, decided to open a great sewer 

 through this very bluff to get a lower outlet to the river. A 

 trench twelve feet wide and some thirty feet deep, the full depth 



'Abbott, C. C. Primitive Industry, pp. 493-510. 



