594 Vestiges of Glacial Man in Minnesota. [June, 
When calculations shall be based upon the best data obtain- 
able as to the materials of the earth’s interior and their arrange- 
ment therein, then, and not till then, will mathematical calcula- 
tions have real weight that geologists are bound to respect, but 
that day is a far distant one. 
In the mathematical discussion of the state of the earth’s inte- 
rior, it has been customary to select a homogeneous globe of 
uniform density, but when the earth has been assumed to be 
heterogeneous and of varying density, it has been regarded as 
composed of layers, the layers being of unequal density when 
compared with one another, but of equal density throughout 
their own mass. 
The more probable condition is that of a globe with a gradual 
increasing density from the exterior towards the interior, but 
with the materials heterogeneously arranged in the so-called lay- 
ers. While the heavier materials would increase in abundance 
and the lighter diminish as the interior was approached, and T 
versa, these materials at any one point would be found to ® 
mixed together in varying proportions, the same as they are p 
meteorites and terrestrial eruptive rocks. While the Po 
the series may, indeed, be free from one another’s ye egw 
the intermediate layers would contain more or less of get 
rials that predominate in the other portions of the 
interior. ; 
(To be continued.) 
:0: 
TA. | 
VESTIGES OF GLACIAL MAN IN MINNESO | 
BY MISS FRANC E. BABBITT. 
aba the open winter of 1878-9 and th 
diately succeeding it, the writer of this pap 
engaged in searching certain terrace surfaces of the tocality ut 
tiver for palzolithic remains supposed to exist at the 
der examination. Rudely worked quartze e 
discovered here by the State geologist of me are 
N. H. Winchell, by whom they had subsequently The field of 
and figured in the State geological report for 187 ete 
exploration lies in central Minnesota, about one d small villag’ 
northwest of St. Paul, and within the township an nt restricted 
of Little Falls, Morrison county. Its area is at P gi 
