His journal is an account of the first five months of settlement in New South Wales, attached to a letter written to George Worgan's brother Richard (written from 20 January to 11 July 1788). The first section was written on the Sirius (12 June 1788) and describes arriving at Sydney Cove,
Port Jackson and his party's first encounter with
Aboriginal Australians. He makes references to a "rough journal" and a fuller journal but these have not been found. Throughout the manuscript Worgan describes the expeditions that the men of the First Fleet make. He describes the coastline of New South Wales, its flora and fauna and the activities engaged in to build the new colony. Explorations in land had been made and he tells of "Park-like Country" and a mountainous region where smoke was seen and thought to be inhabited to the west. He is concerned with water supply and the native vegetation, what might be edible and what might be used for building, he also describes stone. In the journal Worgan is very interested in the various tribes that the First Fleet met and describes their physical attributes, behaviour, way of life and interaction with the Europeans in detail. He describes the female natives' behaviour, their appearance and the many attempts of the Europeans to give them gifts. He describes the convicts, their behaviour, their ailments and injuries, the laws as presented to them and the punishment for their crimes. Marriage between the convicts is an issue he mentions. The female convicts particularly, are the target of his censure for their flouting of the law and spreading disease. The journals were presented to the State Library of New South Wales in 1955 by Mrs Margot Gaye for her deceased aunt, Miss A. Batley. They are digitised and available online via the Library's catalogue. ==Musical background, Worgan's piano, and relationship to Mrs Elizabeth MacArthur==