168 



Gonvexis ; aperture, magnjl, subrotundata,, coerulea.. Hob. Alexandria, Lou. — 

 J. Hale, M.D. 



On motion of Prof. Frazer, Prof. Haldeman was authorized 

 to withdraw his paper, entitled, " Observations on General 

 Phonology and Alphabetical Notation, &c." read to the So- 

 ciety 1st November, 1844; and the Committee thereon was 

 discharged. 



The death of Mr. John Guillemand, of Oxford, a member of 

 this Society, was announced. 



Major Bache laid on the table, for examination by the mem- 

 bers, a map of Sandy Hook, received by him, during the 

 course of the last winter, from Professor Bache, superintendent 

 of the Coast Survey, exhibiting the increase of that headland 

 from the earliest surveys. 



The first survey is by Lieut. John Hill, in 1778. The next was 

 made in 1779, by Des Barres, a name of high authority. Then fol- 

 lows the survey of Capt. John Le Conte, U. S. Assistant Topographi- 

 cal Engineer, of 1819, which is succeeded by that of the Coast Sur- 

 vey of 1836. The survey next in order of time, is that executed by 

 himself in 1842,- and finally, a second survey by the Coast Survey, 

 made in 1844. A comparison of the shore lines of these surveys, 

 omitting Hill's survey, which, from the absence of a general resem- 

 blance found between all those of a subsequent date, is not considered 

 accurate, shows a great increase of that headland northerly. This 

 increase, measured between parallels of latitude, is as follows: — 



From 1779 to 1819, 40 years, 540 feet, or 13.5 feet per year. 

 From 1819 to 1836, 17 years, 1150 feet, or 67.6 feet per year. 

 From 1836 to 1842, 6 years, 630 feet, or 105 feet per year. 

 From 1842 to 1844, 2 years, 200 ket, or 100 feet per year. 



Besides this northerly elongation, the increase in elevation will, on 

 an examination of the soundings at the point of the Hook, appear 

 quite as remarkable. While the Coast Survey of 1836 gives depths 

 of 40 and 102 feet at low water, his survey of 1842, and the Coast 

 Survey of 1844, show fast land at the same points respectively. It 

 would likewise appear by a comparison of the best surveys, that 

 while Sandy Hook is thus making out, Flynn's Knoll, on the other 

 side of the main ship channel, stands fast; thus contracting the width 



