417 



Librarian. — Rev. William H. Drummond, D. D. 

 Clerk and Assistant Librarian. — Edward Clibboni. 



Committee of Science. 



Rev. Franc Sadleir, D. D., Provost of Trinity College; 

 James Apjohn, M.D. ; James Mac CuUagh, LL.D. ; Robert 

 Ball, Esq.; Sir Robert Kane, M.D. ; George J. Allman, M.D. ; 

 Sir William R. Hamilton, LL. D. 



Committee of Polite Literature. 



SamuelLitton, M.D.; Rev. William H. Drummond, D.D.; 

 Rev. 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. ; 

 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. Franc 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 

 cut perpendicularly by a third circle, the times of hodographi- 

 cally describing the intercepted arcs will be equal. 



DONATIONS. 



Abhandlungen der Koniglichen Akademie der Wissen- 

 schaften zu Berlin. Aiis dem Jalire 1844. 



