Death of premier: Beginning of Dwyer-Gray's period in office: 'Ogilvie died on 10 June 1939. Dwyer-Gray was summoned by the Governor on 11 June and commissioned to form a ministry, which he did pending a meeting of caucus to elect a new leader. Caucus met on 6 July and elected Dwyer-Gray leader on the understanding that he would retire at the end of the year; Cosgrove (who was elected deputy leader) and D'Alton did not offer for the leadership on this understanding. Caucus then elected a new ministry, and Dwyer-Gray distributed the portfolios', Hughes and Graham, p. 262, (see 'Sources', below).
Change of party leader: Dwyer-Gray resigned in December 1939 as leader of the Labor Party in accordance with his undertaking (see previous note). Cosgrove was confirmed as leader by caucus and was commissioned as Premier of an Australian Labor Party majority government.
References: For a description of the style of parliamentary government in this period, see John Reynolds, 'Premiers and Political Leaders', in F C Green (editor), Tasmania: A Century of Responsible Government 1856-1956, particularly pp 234-235, (Hobart: L G Shea, Government Printer, ), and note Terry Newman, Tasmanian Premiers 1856-1988: A Biographical Handbook, (Hobart: Tasmanian Parliamentary Library, ).
For a survey of Dwyer-Gray's career, see R P Davis, 'Dwyer-Gray, Edmund John Chisholm (1870 - 1945)', Australian Dictionary of Biography, Volume 8, pp 390-391, (Melbourne: Melbourne University Press, 1981), on line at: http://www.adb.online.anu.edu.au/scripts/adbp-ent_search.php?ranktext=Dwyer-Gray&search=Go%21
'Ministries: Names of the Members of Successive Ministries which have held Office in Tasmania since the inauguration of Responsible Government, together with the Dates of Appointment and Retirement', Journal of House of Assembly, Second Session of the Forty-Fifth Parliament of Tasmania, Anno LIII and LV Eliz II; Session 2 of the 45th Parliament, Volume 251, 2004-2006, (Hobart: Government Printer, Tasmania); Colin A Hughes and B D Graham, A Handbook of Australian Government and Politics 1890-1964, (Canberra: Australian National University Press, 1968, SBN 708102700), and the website of the Parliament of Tasmania, http://www.parliament.tas.gov.au/