(chipped atoms; of ' urope, them classified as Paleolithic, confirmed 
this interpretation and led to the adoption of the vital error that 
a quarter of a century lias not fully eradicated. 
The -degree of success of the chipping work varies with the 
d 
nature of the mtertal, bhen it is had there are numerous fail¬ 
ures, when it is good comparatively few, in the u„per gravel ter¬ 
races on which the city of Washington is built, for example, not 
one boulder or pebble in fifty is of workable quality, and fail¬ 
ures, should work bo undertaken there, would bo very numerous; while 
in the northern suburb of the city the quart a He boulders lend the - 
selves soisowhat readily to the chipping hacuner, failures in skilled 
tends being perhaps not mm than twenty or thirty to one success* 
fhe chipping refuse of the Indian work on one of those sites was 
found to be 6 feet in depth, there not being in the tens of thous¬ 
ands of chipped forms a single one that would not have been classed 
. j *sswaastw/- 
tr»-| I 
as paleolithic in the near past. 
Thirty-SIWfe years ago a large numbers of chopped objects 
