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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|Goldie, Mr. John||Canada||1890||1891|
|Gonzalez de León, Sr. Luis||Mexico||1903||1914|
|Gore, Mr. John Ellard||Ireland||1891||1910|
|Greenwood, Cpt. W. Nelson||United Kingdom||1898||1906|
|Hale, Dr. George Ellery||USA||1900||1938|
|Harrison, Mr. Henry||USA||1913||1929|
|Henry, M. Paul||France||1894||1905|
|Hertzsprung, Prof. Ejnar||Denmark||1946||1967|
|Hirayama, Prof. Kiyotsugu||Japan||1907||1943|
|Hogg, Dr. Helen S.||Canada||1987||1993|