Other important 18th- and early 19th-century surgeons included Percival Pott (1714–1788), who first described tuberculosis of the spine and first demonstrated that a cancer may be caused by an environmental carcinogen after he noticed a connection between chimney sweep's exposure to soot and their high incidence of scrotal cancer. Astley Paston Cooper (1768–1841) first performed a successful ligation of the abdominal aorta. James Syme (1799–1870) pioneered the Symes Amputation for the ankle joint and successfully carried out the first hip disarticulation. Dutch surgeon Antonius Mathijsen invented the Plaster of Paris cast in 1851.