318 L, Lesquereuz on the Origin and Formation of Prairies. 
and upraised above the general surface of the bottom land. 
Thus, after a time, the water thrown on the bottoms by a flood, 
is, at its subsidence, shut out from the river, and both sides of it 
are converted into swamps, sometimes of great extent. Seen 
e 
* The lowest part of these fluvial prairies is of course farthest from the He 
along the bluffs. Here, generally, the cuereiaiiee of water through the banks 
springs and deeper swamps, which are often transformed into peat bogs. 
