J. EF. Hilgard—Tidal Waves and Currents. 125 
favorable times, performs a most important part in maintaining 
the channels through the Sandy Hook bar. 
estimated that the closing of Hell Gate would cause the loss 
of certainly not less than three feet in the depth of those 
annels. 
. 
- “ 
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exaeae hhh ~ ha 
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the removal of the ob- 
gr 
structions, in which work considerable progress has already been 
made. The removal of the reef at Hallett’s Point, the work 
