A collection of diaries and log books providing a daily account of life on Macquarie Island, during Sir Douglas Mawson's expedition to Antarctica, 1911-1914. They include Leslie Russell Blake's handwritten official diary, January 1912-October 1913; four of Harold Hamilton's biological log books, 1 January 1912 to 30 May 1913, with daily entries; a four-page typed manuscript by Arthur John Sawyer (Macquarie Island senior wireless operator 1912) concerning disturbance to radio communications between Macquarie Island, Adelie Island and other stations; a four-page typed and annotated report by Mawson in 1915 on soils on Macquarie Island and extracts from the diary of Charles T. Harrisson (Western Base Team Biologist) of an overland journey on December 14th and 15th, 1911, from the North end to the South end of Macquarie Island. This collection also includes logs kept on board The Discovery, during the British, Australian and New Zealand Antarctic Research Expedition, 2 November 1930 - 2 March 1931, comprising the engineer's daily reports and the 2nd Officer's log.