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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|Frost, Prof. Edwin Brant||USA||1906||1935|
|Hirayama, Prof. Kiyotsugu||Japan||1907||1943|
|Williams, Mr. Arthur Stanley||United Kingdom||1909||1938|
|Harrison, Mr. Henry||USA||1913||1929|
|Schlesinger, Dr. Frank||USA||1916||1943|
|Backlund, Dr. Oskar||Sweden/Russia||1916||1916|
|Baillaud, Dr. Édouard Benjamin||France||1916||1934|
|Dyson, Sir Frank Watson||United Kingdom||1916||1939|
|Lowell, Prof. Percival Lawrence||USA||1916||1916|
|Turner, Prof. Herbert Hall||United Kingdom||1916||1930|