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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|Denning, Mr. William F.||United Kingdom||1891||1931|
|Wolfer, Prof. Alfred||Switzerland||1904||1931|
|Turner, Prof. Herbert Hall||United Kingdom||1916||1930|
|Harrison, Mr. Henry||USA||1913||1929|
|Maunder, Mr. Edward Walter||United Kingdom||1894||1928|
|Bruce, Mr. William||Canada||1927||1927|
|Flammarion, M. Camille||France||1901||1925|
|Barnard, Dr. Edward Emerson||USA||1901||1923|
|Christie, Dr. Sir Wm. Henry Mahoney||United Kingdom||1891||1922|
|Burnham, Prof. Sherburne Wesley||USA||1891||1921|