4l7 
Librarian.—Rey. William H. Drummond, D. D. 
Clerk and Assistant Librarian.—Edward Clibborn. 
Committee of Science. 
Rey. Frane Sadleir, D. D., Provost of Trinity College ; 
James Apjohn, M.D.; James Mac Cullagh, LL. D.; Robert 
Ball, Esq.; Sir Robert Kane, M.D.; GeorgeJ. Allman, M.D.; 
Sir William R. Hamilton, LL. D. 
Committee of Polite Literature. 
Samuel Litton, M.D.; Rev. William H. Drummond, D. D.; 
Rey. Charles W. Wall, D. D.; John Anster, LL. D.; Rev. 
Charles Graves, A. M.; Rev. Samuel Butcher, A. M.; Rev. 
James Wilson, D. D. 
Committee of Antiquities. 
George Petrie, Esq., R. H. A.; Rev. James H. Todd, D.D.; 
J. Huband Smith, Esq., A. M.; Captain Larcom, R. E.; 
7 William R. Wilde, M.D.; F. W. Burton, Esq. ; Samuel Fer- 
_ guson, Esq. 
The President then appointed, under his hand and seal, 
the following Vice-Presidents : 
. Captain Larcom, R. E.; Sir William R. Hamilton, LL. D.; 
_ Rev. Frane Sadleir, D. D., Provost, Trinity College; Rev. 
_ Charles W. Wall, D. D. 
The following note by Sir W. R. Hamilton, announcing a 
theorem of hodographic isochronism, was read : 
If two circular hodographs, having a common chord, which 
_ passes through, or tends towards a common centre of force, be 
_ eut perpendicularly by a third circle, the times of hodographi- 
_ cally describing the intercepted ares will be equal. 
DONATIONS. 
Abhandlungen der Kéniglichen Akademie der Wissen- 
schaften zu Berlin. Aus dem Jahre 1844. 
