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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|Harrison, Mr. Henry||USA||1913||1929|
|Swift, Dr. Lewis A.||USA||1903||1913|
|Kedzie, Mr. John Hume||USA||1890||1903|
|Proctor, Miss Mary||USA||1896||1957|
|Rogers, Prof. William A.||USA||1894||1898|
|Reber, Mr. Grote||USA/Australia||1988||2002|
|Winder, Mr. Daniel K.||USA/Canada||1890||1891|
|Proctor, Mrs. Richard A.||USA/Ireland||1891||1896|
|Shklovsky, Dr. Iosif S.||USSR||1966||1984|
|Ambartsumian, Dr. Viktor Amazaspovitch||USSR/Armenia||1959||1996|