Council of Heads of Australasian Herbaria
Barrett worked in Adelaide as a chromolithographer for the South Australian Government Printer.
As the lithographer for J.E. Brown's The Forest Flora of South Australia (1882), he was responsible for transferring the original paintings onto stone and crafting the colour printing. He also drew the cover illustration for the publication and a few others from photographs.
Source: Extracted from: Wrigley, J.W. (2013) Eucalypt Flowers, National Library of Australia, Canberra.