上海公共租界巡捕房
In early 1901 Boisragon was seconded from the army, and appointed Captain Superintendent of the Shanghai Municipal Police, arriving in March 1901 to take over command. He was forced to resign in the aftermath of the 1905 Shanghai Mixed Court Riot. In 1915 Boisragon published a book for boys, "Jack Scarlett Sandhurst cadet: A story for boys", with illustrations by J. F. Campbell. He died in London on 18 March 1922.