Farquharson’s father, the son of a merchant, succeeded to the Finzean estates in Aberdeenshire on the death of his second cousin Francis Farquharson in 1786. His first wife, this Member’s mother, died in 1793. He subsequently married Mary Campbell of Islay, but died on 8 Mar. 1796. Farquharson’s early life is obscure. At the general election of 1820 he was the late choice of the 6th earl of Kintore as his candidate for Elgin Burghs, where he and Colonel Francis Grant* operated a system of alternating nomination. In Grant’s absence abroad his precarious interest in Elgin was under attack from the 4th Earl Fife* in a campaign marked by kidnappings and legal trickery. Farquharson received the votes of the delegates for Cullen (the returning burgh) and Kintore, while his opponent General Alexander Duff*, Fife’s brother, got those of the Banff and Inverurie delegates. Rival delegates from Elgin voted for their respective candidates, but their votes were rejected as illegal by the returning officer, who declared Farquharson elected by Cullen’s casting vote. Duff’s petition was not pursued.
Farquharson followed Kintore’s opposition line of politics in the House, though he never joined Brooks’s, but after an initial burst of activity before Easter 1821 his attendance fell away dramatically.
Farquharson died childless in May 1841. He was succeeded in the Finzean property by his uncle John Farquharson, who on his death in 1849 was succeeded by his son Francis.
