During his tenure as the Regius Professor of Medicine at Oxford from 1905-1919, Sir William Osler amassed a considerable library on the history of medicine and science. A Canadian native, Osler had studied at McGill University and decided to leave his collection of 7,600 items to its Faculty of Medicine. A catalogue, the Bibliotheca Osleriana, was compiled - a labour of love that took ten years to complete and involved W.W. Francis, R.H. Hill, and Archibald Malloch. Osler himself laid down the broad outlines of the catalogue and wrote many of the annotations. Osler once said, "A library represents the mind of its collector." Bibliotheca Osleriana is more than a catalogue. It is the portrait of a great man.The first edition was published by the Clarendon Press, Oxford, ten years after Osler's death in 1929. This edition is based on the 1969 reprint and includes an introduction by Lloyd G. Stevenson.