Greetings once more Ed...
By the courtesy and kindness of an unknown researcher on www.rootschat.com the information as follows below and attached above has now come to hand...
'Miss M.L Vallance - Age: 25 years' sailed on 'Voyage 41' of the Passenger Steamship 'SS Great Britain' which left Liverpool, England on 27 October, 1873 and after 56 days arrived in Melbourne, Victoria, Australia on 21 December, 1873; the attached Wikipedia document makes interesting reading and in part tells that the vessel at times had a crew of 143, could travel under sail alone with favourable winds, and operated on the England-Australia route for almost 30 years...
'SS Great Britain' in dry dock at Bristol, England, is preserved for exhibit as a Museum Ship - another addition to the Ancestral Family related 'must go visit' list...
'Miss Vallance' (albeit given the erroneous age 20 - refer 'Outward passenger lists...' attached) departed Melbourne on the 'SS Gothenburg' on 30 December, 1873...via Hokitika on the West Coast of the South Island of New Zealand on 5 January 1874, then progressively at the further South Island Ports of Greymouth and Nelson, prior to a midnight 7 January, 1874 arrival in Wellington, on the lower tip of North Island, New Zealand...
Thereby, and following a 'world wide' separation of 'as the crow flies' distance approx 11,593 miles/18,656 kilometres, and the duration 21 May, 1863 to 7 January, 1874, the elder/younger 'Vallance' siblings Mary Eliza Dunscomb/Miriam Lois were reunited...
e-mail from Lindsay McLean, Nov. 27, 2018