alee, GEOLOGY OF OHIO. 
feet above the lake, above which the ice-sheet must have risen several 
hundred feet. 
GLACIATED AREA OF NortH AMERICA. 
We have inserted on page 756 a map of a portion of the glaciated area 
of North America. The arrows indicate the direction of glacial striz, as 
collected by Prof. Chas. H. Hitchcock, from various geological sources. 
The portion of the boundary of the glaciated area consisting of broken 
lines is hypothetical; the rest has been accurately determined as described 
in the text. The special glacial accumulations indicated by the broad 
lines in the interior belong to what Professor Chamberlin calls the 
“Kettle Moraine” (see Geological Reports of Wisconsin and Minnesota.) 
The dark line southwest of Lake Erie represents the supposed moraine 
of a Lake Erie glacier described on page 50, volume II, of this report. 
The shaded area, marked ‘‘Lake Agassiz,” is supposed by Minne- 
sota geologists to be the bottom of an immense glacial lake which existed 
so long as the ice dammed up the northern outlets to that region. The 
shading upon the rivers indicates the terraces which characterize all 
streams connected with the glaciated area. In New England the 
shading is seen to be independent of streams where it represents kames, 
which are gravel accumulations connected with the close of the glacial 
period, and corresponding in many respects to terraces in character, but 
independent of water-courses. (For fuller description see the sixth 
chapter of my “Studies in Science and Religion.” Andover: W. F. 
Draper.) 
NOTE.—I regret very much that through a misunderstanding one form of Professor Wright’s 
report was sent to press before his corrected proof had been received. When the proof came to hand, 
the press was stopped and corrections were made, as far as practicable, but one half of the edition had 
been already printed. The result is that a number of minor errors will be found on pages 753-768, in- 
elusive, in part of the volumes. They are not, however, deemed sufficiently important to require a 
special table of errata. E, O. 
