The Sir William Osler Collection, distinct from the Bibliotheca, is an extensive archival holding of Osler's correspondence (including eighteen hundred original letters), daybooks, accounts, engagement books, legal documents, book invoices, membership certificates, notebooks, lectures, addresses, newspaper clippings, photographs, books with manuscript additions, and miscellaneous loose items formerly inserted into individual books in his library. The collection also contains various family papers, including correspondence of Lady Grace Revere Osler and Edward Revere Osler.

Letter to Emanuel Libman from William Osler, 13, Norham Gardens, Oxford, Oxfordshire, England. Sorry for the mistake, will have the Secretary rearrange it. (International Congress of Medicine).

Letter to Fielding Hudson Garrison from William Osler, From the Regius Professor of Medicine, Oxford, Oxfordshire, England. Congratulations and compliments his book.

Letter to John Young Walker MacAlister from William Osler, From the Regius Professor of Medicine, Oxford, Oxfordshire, England. Tells him that he may be interested in his collection of early printed medical books at the Bibliographical Society next Monday. Asks him permission to take for exhibition the Simon Genuensis, 1474, the Petrus Padubantensis, 1477, the Mundinus, 1478, and the Mesue, 1479. Technical details on the shipping and the receiving of them. Civilities.