Physical Features of Michigan. 39 
axes along the euronotal. The Sturgeon River rises near Lake 
Michigan, flows N.W. 11 miles, then S.W. 8 miles (meeting a 
tributary from the S.W.), then N.W. 7 miles, then N.H. 25 
miles, into Portage Lake, thence S.E. 6 miles through Portage 
River into Kewenaw Bay—thence finally N.E. through Kewenaw 
Hay into Lake Superior. 
hese examples may serve to illustrate sufficiently the law 
enunciated. But its application is not confined to Michigan. 
The Maumee River of Ohio, with its tributaries, is a striking 
reproduction of the Saginaw and its affluents. The Maumee, 
conforming strangely to the law of diagonism; while, on the 
other hand, the river and gulf of St. Lawrence are a further in- 
fashioned the actual surface, has exerted a greater energy in the 
direction of the diagonals than in the direction of the cardinal 
The causes of these curious phenomena are not difficult to 
discover. Geological structure will, indeed, be found closely 
connected with them. The watershed of the Monistique Penin- 
sula follows, in its general trend, the strike of the Lower Silurian 
strata; as the southeastern watershed of the lower peninsula 
follows nearly the belt of outcrop of the Marshall sandstone. 
* Proceedings Amer. Assoc., Dubuque Meeting; 1872. 
