The author was a member of a scientific expedition which visited Easter Island from 29 March 1914 to 18 August 1915. A brief call was also made at Pitcairn Island. The expedition travelled in the yacht Mana. Routledge published an account of the expedition in her book 'The Mystery of Easter Island', London (1919).

Reel 1: Correspondence, 1910-1912; miscellaneous notes; copies of printed accounts of Easter Island, including Rudolf Philippi, 'La Isla de Pascua i su habitantes', Anales de la Universidad de Chile, vol.43, May 1873, pp.365-434, Carl Burckhardt, Traces Geologiques d'un Ancien Continent Pacifique, La Plata, 1900. V.S. Frank, 'A trip to Easter Island', Journ. Franklin Inst., vol.162, No.3, 1906, Philadelphia; Easter Island bibliography; article from Nautical Magazine, 1863, pp.608-614.
Reel 2: Notes on archaeological remains; correspondence with Enrique Merlet, Lessee of Easter Island; Easter Island clans - first list; caves; notes on Easter Island history; census details; vocabulary; maps; genealogies; legends; notes on statues.
Reel 3: Diary, April 1914 - August 1915.
Reel 4: Letter from Lieut. D.R. Ritchie, commander of expedition, to chief of island on stealing of cattle, etc.; preliminary report on the collection of human skulls and bones from Easter Island by Arthur Keith, 1 Sept. 1916; notes on exterior quarries; reviews of The Mystery of Easter Island;newspaper clippings re expedition; photographs; catalogues of objects obtained on Easter Island by the expedition.