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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|Darwin, Dr. Sir George Howard||United Kingdom||1894||1912|
|Clerke, Miss Agnes M.||United Kingdom||1891||1907|
|Clemence, Dr. Gerald M.||USA||1964||1974|
|Christie, Dr. Sir Wm. Henry Mahoney||United Kingdom||1891||1922|
|Campbell, Prof. William Wallace||USA||1905||1938|
|Burnham, Prof. Sherburne Wesley||USA||1891||1921|
|Bruce, Mr. William||Canada||1927||1927|
|Brown, Dr. R. Hanbury||United Kingdom/Australia||1987||2002|
|Brashear, Dr. John A.||USA||1901||1920|
|Bowen, Dr. Ira S.||USA||1956||1973|