Haupt. ] 40 [Dec. 16, 
Such being some of the practical results which it is claimed 
must follow from the discovery of the general direction and 
mode of action of the flood tide upon harbor inlets, an in- 
telligent application of the principles should result in improv- 
ing commercial intercourse, reducing the risks of navigation, 
lowering the rates of freight and insurance, and cheapening 
the cost of the construction of such works to the general gov- 
ernment. 
All of which is respectfully submitted for your consideration 
in compliance with a requirement of the By-Laws govern- 
ing applications requiring an impartial but searching investi- 
gation. 
SUPPLEMENT TO THE PAPER ON THE PHYSICAL PHENOMENA, 
Ere. 
Since writing the above paper, I have seen and made a copy 
of a comparative survey chart of Barnegat Inlet, which so fully 
sustains the theory of the cause and direction of the move- 
ment and shows so conclusively the practical value of such 
knowledge that it is submitted herewith as additional informa- 
tion. The notes on the tracing, excepting the date of the sur- 
veys, are my own, They will sufficiently explain the direc- 
tions of the movements without further elaboration. 
It appears from this chart, that the lighthouse erected in 
1834 was destroyed by the encroachments of the sea, presum- 
ably just prior to the construction of its successor in 1858. 
This would give an average rate of scour on the ¢nner beach of 
thirty (80) feet per year, due to the retarded flood and ebb 
currents at this point. 
T'o protect the present structure, which was placed about 
eight hundred (800) feet to the south, three (3) or more jetties 
