上ビルマ
Farrer's final voyage was to the mountains of Upper Burma. He took as his companion the mill-owner Euan Hillhouse Methven Cox, who recorded the trip in "Farrer's Last Journey, Upper Burma 1919–20" (1926). This expedition proved less horticulturally successful than Farrer's earlier trip to Kansu, largely because the climate of the Burmese mountains had less in common with British conditions than that of Kansu.