- r — „ WM w „ ^^^ i0 MW . ..nportant in 



any discussion of the locations of glacial strise or polish or 

 the relations between the possible quarrying and abrasive 

 actions of a glacier. It is not that the stream does actually 

 move in a parabolic path but merely that at any point along 

 its course its tendency is so to move. The actual path 

 determined depends either on the ability of the stream to 

 corrade, or its tendency to aggrade its channel floor and 

 sides, the curve in the first case being concave, and in the 

 second case convex to the sky. 



All streams, moreover, have their power of transportation 

 raised as the sixth power of the velocity and their energy 

 increased directly, both as the increase of the cross-section 

 of the stream aa Qa +ho tiu'wi nnnm-* ^t +i, Q ^ Q ir.r.;* «■ -n.,* 



i third power of the velocity. But 



