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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|Langley, Dr. Samuel Pierpont||USA||1894||1906|
|Lindblad, Dr. Bertil||Sweden||1956||1965|
|Loewy, M. Maurice||France||1901||1907|
|Lowell, Prof. Percival Lawrence||USA||1916||1916|
|Maunder, Mr. Edward Walter||United Kingdom||1894||1928|
|McLeod, Dr. Clement Henry||Canada||1894||1917|
|Mitchell, Prof. Samuel||Canada/USA||1958||1960|
|Monck, Prof. William Henry Stanley||Ireland||1898||1915|
|Moore, Sir Patrick||United Kingdom||1993||2013|
|Morrison, Dr. Joseph||Canada/USA||1891||1898|