A, D, Bache on the Tidal Currents of New York Bay. 837 
to the end of Sandy Hook; it is the grand current, in fact, 
which makes the False Hook channel, and the False Hook 
occupies the debateable ground between the outside and False 
Hook channel currents at certain times of tide, and is built up 
by the slackening ebb. In this point of view the shoal tends to 
restore equilibrium. The difference of action of flood and ebb is 
defined by this shoal. At station V on the southern extremity 
of the outer middle ground, and in close proximity to the lower 
entrance of False Hook channel, the currents are feeble, and an 
equilibrium of ebb and flood drifts seems to be established. It 
would appear that the scouring action of the tidal currents is in- 
sufficient to keep the bar of this channel open. 
t is the material carried along the outer shore of Sandy Hook, 
and deposited at the point, which chiefly causes the growth of 
the Hook. Whenever it shall be considered desirable to limit 
this increase it will be easy to do so, by a series of jetties so 
as to arrest the movement of the sand to the northward, 
successive structures stopping the material which may pass round 
the point of the more southwardly jetties. 
Bay, let us suppose it divided into three sections, eastern, mi 
and western, and ascertain the relations of direction at succes- 
y Hook is subject 
to a counter drift or whirl. This whirl is increasing 1m size, and 
ND SERIES, Vou. XXVI, No. 78.—NOV., 1858. 
44 
