EFFECT OF SEA BARRIERS UPON DRAINAGE 451 
parallel to the old coast line in much the same way that Indian 
River, Florida, has its course fixed at the present time. 
Many others could be mentioned, but these serve to show 
the character of the drainage that might be expected from the 
suggested causes. 
It is not meant to imply by the foregoing remarks that all 
barriers that may be formed will exercise control on the ultimate 
drainage. Probably most of those formed are quickly destroyed 
as the shore line encroaches or recedes. It is hardly reasonable 
to suppose, however, that all barriers formed through past 
geologic ages have been disposed of thus easily. 
Joun F. Newsom. 
STANFORD UNIVERSITY, 
California. 
