Adamson represented the Murray district in the first Legislative Assembly of Victoria, which assembled in November 1856. On 3 February 1858, he resigned the seat, having accepted the role of Prosecuting Barrister for Melbourne, and was re-elected to the assembly in a by-election on 22 February.[4] In 1859, The Murray was changed to a single-member district, and Adamson contested the new electoral district of Castlemaine but was defeated.
Adamson was appointed solicitor-general in the Nicholson government from 27 October 1859 to 5 March 1860,[5] and then Crown Prosecutor until he resigned in February 1883.[6] He left Victoria for England, and resided in London where he died in 1897.[7]
^"NEW SOUTH WALES". The Argus (Melbourne). No. 3637. Victoria, Australia. 5 February 1858. p. 4. Retrieved 4 February 2019 – via National Library of Australia.