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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|Baillaud, Dr. Édouard Benjamin||France||1916||1934|
|Flammarion, M. Camille||France||1901||1925|
|Loewy, M. Maurice||France||1901||1907|
|Henry, M. Paul||France||1894||1905|
|Unsöld, Dr. Albrecht||Germany||1956||1995|
|Baade, Dr. Wilhelm Heinrich Walter||Germany||1954||1960|
|Vogel, Dr. Hermann C.||Germany||1894||1907|
|Monck, Prof. William Henry Stanley||Ireland||1898||1915|
|Gore, Mr. John Ellard||Ireland||1891||1910|
|Hirayama, Prof. Kiyotsugu||Japan||1907||1943|