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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|Gonzalez de León, Sr. Luis||Mexico||1903||1914|
|Monck, Prof. William Henry Stanley||Ireland||1898||1915|
|Fleming, Dr. Sir Sandford||Canada||1890||1915|
|Backlund, Dr. Oskar||Sweden/Russia||1916||1916|
|Lowell, Prof. Percival Lawrence||USA||1916||1916|
|King, Dr. William Frederick||Canada||1892||1916|
|Downing, Dr. Arthur Matthew Weld||United Kingdom||1896||1917|
|McLeod, Dr. Clement Henry||Canada||1894||1917|
|Pickering, Dr. Edward Charles, OPM||USA||1894||1919|
|Brashear, Dr. John A.||USA||1901||1920|