179O, 1791. 



Samuel Duffleld, M.D., 

 Benjamin Smith Barton, 

 Charles W. Peale. 



Charles W. Peale, 

 Robert Hare, Jr., 

 John R. Smith. 



1792 to 1794, inclusive. 



Charles W. Peale, 

 Benjamin Smith Barton, 

 Caspar Wistar, M.D. 



1795, 1790. 



Benjamin Smith Barton, 

 Charles W. Peale, 

 Thomas Parke, M.D. 



1797, 1798. 



Charles W. Peale, 

 Benjamin Smith Barton, 

 Robert Patterson. 



1799. 



Charles W. Peale, 

 Benjamin Smith Barton, 

 Rev. Nicholas Collin. 



1811 to 1813, inclusive. 



John R. Smith, 

 Robert Hare, Jr., 

 Zaccheus Collins. 



1814, 1815. 



Zaccheus Collins, 

 Joseph Cloud, 

 William Hembel, Jr. 



1816. 



Zaccheus Collins, 

 Joseph Cloud, 

 Samuel Calhoun, M.D. 



1817, 1818. 



Zaccheus Collins, 



Joseph Cloud, 



Thomas Tickell Hewson. 



1800. 



Charles W. Peale, 

 Benjamin Smith Barton, 

 George Turner. 



1801, 1802. 



Charles W. Peale, 

 Robert Leslie, 

 John R. Smith. 



1803. 



Charles Peale, 

 Robert Leslie, 

 William S. Jacobs, M.D. 



1819, 182O. 



Joseph Cloud, 



Thomas Tickell Hewson, 



Reuben Haines. 



1821, 1822. 



Joseph Cloud, 



Thomas Say, 



William E. Homer, M.D. 



1823. 



Thomas Say, 



William E. Homer, M.D., 



Jesse Lukens. 



1804 to 18O8, inclusive. 



Charles W. Peale, 

 Robert Hare, Jr., 

 John Church, M.D. 



1824 to 1827, inclusive. 



Thomas Say, 



William E. Horner, M.D., 



James Mease, M.D. 



