1848—Dr. Ludwig Leichhardt's last expedition.
1848—E. Kennedy's fatal venture up Cape York Peninsula.
1848—A. C. Gregory, with party, explore the Gascoyne.
1848—Governor Fitzgerald, of Western Australia; examined the new mineral discovery, accompanied by A. C. Gregory, and named the Geraldine Aline.
1848-49—J. S. Roe, Surveyor-General of Western Australia; from York to Esperance Bay.
1851—Messrs. Oakden and Hulkes; on west side of Lake Torrens.
1852—Hovenden Hely, in charge of search party for Leichhardt; from Darling Downs.
1854—R. Austin, Assistant Surveyor-General of Western Australia; in search of pastoral country, and to examine the interior for auriferous deposits.
1855—Sir Thomas Mitchell died near Sydney.
1855-56—A. C. Gregory and Baron von Mueller North Australian expedition, in search of Leichhardt; discover Sturt's Creek and the Elsey.