Dr. Foster, after giving many of the reputed proofs of man’s antiquity here, sums up the argument in the following language: “The evidence, it must be confessed, rests, in most cases, upon the testimony of a single observer, and besides, there has not been a recurrence of ‘finds’ in the same deposit (except in the gravel beds of Colorado and Wyoming, which require further investigation to command an unqualified belief), as in the valley of the Somme and in the European caves, which is so conclusive as to the existence of man as contemporary with the great Pachyderms.”—Foster’s Pre-Historic Races, p. 71.
Mr. Bancroft says of the theory, “If we may judge by the recent results of scientific investigation, [it] may eventually prove to be scientifically correct. To express belief, however, in a theory incapable of proof, appears to me idle. Indeed such belief is not belief, it is merely acquiescing in or accepting a hypothesis or tradition until the contrary is proved.”—Native Races, vol. v, pp. 130–1.