Comment There is no evident person at that time with the name "John Stirling Craig". The only printed reference is the work, and newspaper reports of the work. 1861 census does not show a "John Craig" as a surgeon or physician at quick search, and no name in Scottish registry records of the time of that name.
Quite possible that this is printed as a pseudonym. — billinghurst sDrewth 06:29, 5 May 2020 (UTC)