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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|Shearmen, Mr. T.S.H.||Canada||1890||1900|
|King, Dr. William Frederick||Canada||1892||1916|
|McLeod, Dr. Clement Henry||Canada||1894||1917|
|Russell, Rev. Norman H.||Canada/India||1898||1902|
|Plaskett, Prof. Harry H.||Canada/United Kingdom||1961||1979|
|Mitchell, Prof. Samuel||Canada/USA||1958||1960|
|Morrison, Dr. Joseph||Canada/USA||1891||1898|
|Hertzsprung, Prof. Ejnar||Denmark||1946||1967|
|Strömgren, Prof. Bengt G.||Denmark||1968||1987|
|Dollfus, Dr. Audouin C.||France||1975||2011|