台灣基督長老教會
On 16 June 1865, at the urging of missionaries H. L. Mackenzie and Carstairs Douglas, he established the first Presbyterian church in Taiwan, this date now celebrated by the Presbyterian Church in Taiwan as its anniversary. First his mission centred in the then-capital Taiwan Fu (now Tainan City); in 1868 he moved near Cijin (now part of Kaohsiung) where his work, both medical and missionary, became more welcomed. In early 1872 he advised Canadian Presbyterian missionary pioneer George Leslie Mackay to start his work in northern Taiwan, near Tamsui.