Mgr Collomb, of the Society of Mary, was Bishop of Antipheles and Vicar Apostolic of Melanesia and Micronesia

The journal is in three exercise books:

Vol.1: November 1845 - March 1847, includes voyage from Europe to Sydney
Vol.2: April 1847 to Collomb's death in July 1848. It includes an account of the abandonment of the Marist mission at San Cristobal, 3 November 1847, and the arrival at Woodlark Island, 15 November 1847; also the division of the missionaries, 9 May 1848, with Montrouzier, Thomassin and Bro. Aristide remaining on Woodlark, and Collomb, Fremont, Villien and Bro. Optat starting a mission on Rook (Umboi) Island.
Vol.3: A collection of copies of letters and an account of events remembered by Collomb beginning April 1847. (Collomb mislaid his journal for a time and believed it lost. He tried to reconstruct it from memory. Then the journal was found and continued.)