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|
|Dollfus, Dr. Audouin C.||France||1975||2011|
|Downing, Dr. Arthur Matthew Weld||United Kingdom||1896||1917|
|Dyson, Sir Frank Watson||United Kingdom||1916||1939|
|Elger, Mr. Thomas Gwyn Empy||United Kingdom||1896||1897|
|Espin, Rev. Thomas Espinell||United Kingdom||1894||1934|
|Flammarion, M. Camille||France||1901||1925|
|Fleming, Dr. Sir Sandford||Canada||1890||1915|
|Frost, Prof. Edwin Brant||USA||1906||1935|
|Goldberg, Dr. Leo||USA||1974||1988|