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.
| Nation(s) | Start |
End |
|
|---|---|---|---|
| Pettit, Mr. H. | Canada | 1890 | 1890 |
| Hunter, Mr. Andrew F. | Canada | 1890 | 1891 |
| Winder, Mr. Daniel K. | USA/Canada | 1890 | 1891 |
| Goldie, Mr. John | Canada | 1890 | 1891 |
| Kirkwood, Dr. Daniel | USA | 1890 | 1895 |
| Proctor, Mrs. Richard A. | USA/Ireland | 1891 | 1896 |
| Peal, Mr. Samuel Edward | United Kingdom/India | 1891 | 1897 |
| Elger, Mr. Thomas Gwyn Empy | United Kingdom | 1896 | 1897 |
| Morrison, Dr. Joseph | Canada/USA | 1891 | 1898 |
| Rogers, Prof. William A. | USA | 1894 | 1898 |