a 
x 
ge tions of that establishment bring under tribute so large “1 
316 Geographical Notices. 
2. The chronometer expeditions for the determination of longi- 
tude begun in 1849, have been continued, but in the prospect of 
telegraphic communication between Europe and America are 
now to be suspended. ‘The final longitude for these voyages is 
reported by Mr. G. P. Bond, as Cambridge, west of Greenwich 
4h 44m 31°89s, with a probable error of 0-198; or from Liverpool 
4h 32m 31-848, with a probable error of 0719s. Prof. Bache re- 
marks that after a careful comparison of this and former results 
e has come to the conclusion that the previous expeditions 
must be considered as mainly preparatory, their use having been 
in pointing out the errors to which the methods were liable, and 
in suggesting the proper means of eliminating them. 
8. The survey of New York harbor, conducted at the request 
of the Commissioners on the Harbor Encroachments of New 
York is still in progress. Important results have been reached 
in respect to the well-established fact of the increase of Sandy 
ook to the northward, thus narrowing the main ship-channel 
entrance. It is found that the deposit is caused by a slowly 
moving northwardly current on both sides of the Hook, running” 
on the outer side more than seven hours out of the twelve, am 
on the inner, eleven hours out of the twelve, during both 
ebb and flvod tides, and meeting at the point of the Hook. _ 
inner current is the one by which the flood and ebb tides. 
by the lateral communication of motion, the water from 
piven 
for 1856. It is og to publish the whole series as 
. his 
E. B. Hunt makes a report on the progress yer ; 
ical transactions, — 
ion of the arena of physical science, that the volume W!" 
service to all who are interested in geodesy, geography: “ 
