410 Scientific Intelligence. 
the same process which has resulted in the present much 
northern part of this region 
“Unless explained by relative differences in level during the 
they can be proved to have existed, it would also prove, in the 
at present, seems a onable supposition, but must be regarded 
no longer as merel hypothesis, for the position of the ine 
glacial materials in the bowlder-clay offers a strong positive argu 
ment in its favor. I t be supposed that these bed 
of the present surface of the country, as a whole. 
“ The elevation of the beds in the intermediate Drift-wood bend 
miles westward on the same line, and the resulting slope pet ™ 
is 4:3 feet, in addition to that of the river, in the same easterly 
direction, a rate of fall locally much greater than that abov 
determined for the whole distance, 
*See also Geology and Resources of the 49th Parallel, p. 264 ‘ 
