GLACIAL MAN IN THE TRENTON GRAVELS. 21 



upwards of twenty trenches through similar gravel deposits, and 

 was therefore well qualified for the work. Prof. W. J. McGee, 

 Prof. R. D. Salisbury, Dr. Stewart Culin and Dr. Abbott also 

 visited the place one or more times each. Relics of art were 

 found upon the surface and in such portions of the talus as hap- 

 pened to be exposed, but nothing whatever was found in the 

 gravels in place, and the search was closed when it became 

 fully apparent that the case was hopeless. 



It may be claimed that the conditions under which gravels 

 are exposed in trenching as it progresses, are not as favorable 

 for the collection of enclosed relics as where exposed by natural 

 processes of weathering. This is true in a certain measure, as 

 specimens may be obscured by the damp clinging sand which 

 forms the matrix of the gravels. This, however, would interfere 

 but little with the discovery of large flaked stones, such as we 

 were led to expect in this place, and this slight disadvantage in 

 detecting shaped pieces in fresh exposures is more than over- 

 balanced by the treachery of weathered surfaces which often 

 give to intrusive objects the appearance of original inclusion. 

 The opportunity for studying the gravels in all their phases of 

 bedding, composition and contents, was really excellent, and no 

 one could watch the constantly renewed exposures hour after 

 hour for a month without forming a most decided notion as to 

 the implement bearing qualities of the formation. Not the 

 trace of a flaked stone, or of a flake or artificial fragment of any 

 kind was found, and we closed the work with the firm conviction 

 that the gravels exposed by this trench were absolutely barren of 

 art. But Dr. Abbott claims to have found numerous implements 

 in the bluff face a few feet away and in the same gravels. If 

 this is true, the conditions of glacial occupation of this site must 

 have been indeed remarkable. It is implied that during the 

 whole period occupied by the melting of the ice sheet within the 

 drainage of the Delaware valley the hypothetical rude race lived 

 on a particular line or zone afterwards exposed by the river to 

 the depth of 30 feet, leaving his strange "tools " there by the hun- 

 dreds, while another line or zone, not more than forty feet away 



