The fonds consists of the correspondence of Sir John A. Macdonald. Included are letters from politicians, cabinet ministers, bureaucrats, religious figures and businessmen. There are approximately 100 individuals represented in this series with whom there was considerable correspondence. Among the most voluminous correspondence is that from Gilbert McMicken (secret service reports); Sir George Stephen; Sir Alexander Campbell; Hon. Edgar Dewdney; Sir Alexander T. Galt; Lawrence Vankoughnet; Sir David Macpherson; and Sir Charles Tupper.