F. W. A. Argelander International Member (elected 1864)
March 3, 1799 - February 17, 1875

Spencer F. Baird Member (elected 1864)
February 3, 1823 - August 19, 1887

L. Elie de Beaumont International Member (elected 1864)
September 25, 1798 - September 21, 1874

David Brewster International Member (elected 1864)
December 11, 1781 - February 10, 1868

Robert W. Bunsen International Member (elected 1864)
March 31, 1811 - August 16, 1899

Michel Chasles International Member (elected 1864)
November 15, 1793 - December 18, 1880

John Dalton Member (elected 1864)
February 2, 1825 - February 2, 1889

Michael Faraday International Member (elected 1864)
September 22, 1791 - August 25, 1867

William R. Hamilton International Member (elected 1864)
August 4, 1805 - September 2, 1865

Leo Lesquereux Member (elected 1864)
November 18, 1806 - October 25, 1889

Henri Milne-Edwards International Member (elected 1864)
October 23, 1800 - July 29, 1885

G. A. A. Plana International Member (elected 1864)
November 8, 1781 - January 20, 1864

Karl E. von Baer International Member (elected 1864)
February 17, 1792 - November 28, 1876