FISHER: RIVER TERRACES 
25 
stream-causing it to depart from its channel ,—a change which is 
inevitable because of the lower grade attained by the more vigorous 
stream. As a result, the left-hand channel will be deserted, a sand 
bar added to the left-hand widening flood plain, and the river moved 
Fig. H.— Diagram of the mature stage of the partition flood plain built by 
Canoe Brook seven miles from Brattleboro, Vt. Ridges represent the 
one-time sand-bar islands and the valleys the deserted river channels. 
Current flows toward top of figure. 
to the right; and thus one stage of the process will be complete. So 
long as the new curves are being developed, the position of the river 
channel, noticeably at flood time, may be greatly changed, and there 
will be a repetition of the island process. A few hundred feet up the 
brook just referred to, there is a good illustration of the same process 
in a more mature development (plate 11 and text-figure H). To the 
left of the stream, four deserted river channels are found separated 
