85 



PRESIDENTS. 



BENJAMIN FRANKLIN, 



Elected 2d January, 1769 ; died 17th April, 1790. 



DAVID RITTENHOUSE, 



Elected 7th January, 1791 ; died 26th June, 1796. 



THOMAS JEFFERSON, 



Elected 6th January, 1797 ; resigned in January, 1815 ; died 1th July, 1.S26. 



CASPAR WISTAR, 



Elected Cth January, 1815; died 22d January, 1818. 



ROBERT PATTERSON, 



Elected 1st January, 1819 ; died 22d July, 1824. 



WILLIAM TILGHMAN, 



Elected 7th January, 1825 ; died 29th April, 1827. 



PETER STEPHENSON DUPONCEAU, 



Elected 4th January, 1828 ; died 1st April, 1844. 



ROBERT M. PATTERSON, 



Elected 3d January, 1845; declined accepting the position. 



NATHANIEL CHAPMAN, 



Elected 2d Januarj', 1846 ; died 1st July, 1853. 



ROBERT M. PATTERSON, 



Reelected 5th January, 1849 ; died 5th September, 1854. 



FRANKLIN BACHE, 



Elected 7th January, 1853 ; died 19th March, 1864. 



ALEX ANDE R DALLAS BACHE , 



Elected 5th January, 1855 ; died 17th February, 1867. 



JOHN K. KANE, 



Elected 2d January, 1857 ; died 21st February, 1858. 



GEORGE B. WOOD, 



Elected 7th January, ls'59 ; died 30th March, 1879. 



FREDERICK FRALEY, 



Elected 2d January, 1880. 



