Honorary Membership was limited to 10 from 1890-1900, and to 15 from 1901 onwards. Corresponding Membership was a lesser class of Honoris causa membership in the early years. A few honorary members, such as Barnard, were first made corresponding members for a short time before being recommissioned as honorary members.
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|Gonzalez de León, Sr. Luis||Mexico||1903||1914|
|Ball, Dr. Sir Robert Stawell||United Kingdom||1894||1913|
|Swift, Dr. Lewis A.||USA||1903||1913|
|Darwin, Dr. Sir George Howard||United Kingdom||1894||1912|
|Terby, M. François J.||Belgium||1894||1911|
|Huggins, Dr. Sir William||United Kingdom||1891||1910|
|Gore, Mr. John Ellard||Ireland||1891||1910|
|Newcomb, Rear Admiral Dr. Simon||USA||1891||1909|
|Loewy, M. Maurice||France||1901||1907|
|Vogel, Dr. Hermann C.||Germany||1894||1907|