Robert Brown was one of the first professional botanists to visit Australia. He accompanied Flinders on his official circumnavigation of Australia in the ship Investigator, and later collected extensively in New South Wales and Tasmania. The result was published, in part in his Prodromus (1810), and in other shorter works, particularly on Proteaceae. This diary charts Brown's 5 year visit to Australia, and provides additional notes about many of his collections and of the localities visited.