In later life Costello lived in Paris, working mostly as a writer. He died there on 15 August 1867.[2]
Works
Costello edited the Cyclopædia of Practical Surgery, including a copious bibliography; of which 12 parts were published in London, 1841–3. Contributors included Walter Hayle Walshe, and John Gay who wrote on "cleft palate".[2][3][4] In his Paris years, Costello was able to complete the work in four volumes (1861), using his own English translations of articles by French surgeons.[1]
Costello wrote also An Address to the Visiting Justices of the Hanwell Lunatic Asylum (1839), and A Letter to Lord Ashley on the Reform of Private Lunatic Asylums (1845).[1]