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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|Struvé, Dr. Otto||USA||1959||1963|
|Adams, Dr. Walter Sydney||USA||1945||1956|
|Stebbins, Dr. Joel||USA||1958||1966|
|Schlesinger, Dr. Frank||USA||1916||1943|
|Burnham, Prof. Sherburne Wesley||USA||1891||1921|
|Campbell, Prof. William Wallace||USA||1905||1938|
|Frost, Prof. Edwin Brant||USA||1906||1935|
|Pickering, Mr. William Henry||USA||1894||1938|
|Lowell, Prof. Percival Lawrence||USA||1916||1916|
|Russell, Prof. Henry Norris||USA||1946||1957|