844 J. D. Dana—Koch's Evidence on the Cotemporaneity of 
ignorant of geology and without scientific training, we are 
forced to doubt, to doubt strongly, his direct and definite state- 
ment that he had devoted the greater part of his life to “the 
theoretical study of Natural History” and had made himself 
‘intimately acquainted with the practical part of it.” It is 
true that he knew about the earlier part of his own life better 
than any other person then living. Any way, he certainly 
overrated almost infinitely the results on himself of so prolonged 
study. This much we are disposed to allow in favor of his 
sagacity: that Dr. Koch appreciated the absurdity of the 
Leviathan story, and introduced it, after some thought about 
the people he was among, merely to get a full house for his 
Missourium ; and that his attempted show of scientific knowledge 
had the same end in view. If this supposition is unjust to him, 
the other alternative explanation has to stand. In his New 
Orleans “ Hydrachen” pamphlet (1853), the inside pages of the 
cover contain a long cited article* which makes the Zeuglodon 
the Leviathan of Job—thus showing apparently that his previ- 
ous convictions were not too strong for a change of opinion, 
especially after the Missourium had turned into a Mastodon. 
The special statements respecting the mode of occurrence of 
the human relics cited on pages 838 to 840 remain for con- 
sideration. 
observer. 
The description of the deposits in Gasconade County, con- 
taining the remains of an animal “the principal part of which 
had been consumed by fire,” is a still more unsatisfactory basis 
for a safe conclusion as to age. But in the article of 1857 he 
* Tt is headed ‘From the New York Evangelist,” and must have been written 
in 1845, when the skeleton was on exhibition in New York City. The author's 
