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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|Campbell, Prof. William Wallace||USA||1905||1938|
|Wolfer, Prof. Alfred||Switzerland||1904||1931|
|Swift, Dr. Lewis A.||USA||1903||1913|
|Gonzalez de León, Sr. Luis||Mexico||1903||1914|
|Barnard, Dr. Edward Emerson||USA||1901||1923|
|Brashear, Dr. John A.||USA||1901||1920|
|Flammarion, M. Camille||France||1901||1925|
|Loewy, M. Maurice||France||1901||1907|
|Hale, Dr. George Ellery||USA||1900||1938|
|Monck, Prof. William Henry Stanley||Ireland||1898||1915|