The answer can be read directly from the preliminary pages (two pages 
after the title page) of volume fourth (sic) of the supplement.  That 
volume is available on Google books

 (http://books.google.com/books?id=nWEIAAAAQAAJ&printsec=frontcover&dq=intitle:Encyclop%C3%A6dia+intitle:Britannica&hl=en&ei=_ko-TcqgLIKC8gaC87jOCg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC4Q6AEwAA#v=onepage&q&f=false)

FF is James Mill.  The system of indicating the authors is not initials 
(in contrast to the fourteenth edition c. 1930 that I have at home) but 
rather simply to list them and mark them A, B, C, moving to double 
letters (AA, BB ... FF ...) and triple letters (AAA ...) as needed.

Kevin Hoover


Daniele Besomi wrote:
> Dear colleagues,
>
> Does anyone happen to know who wrote the Entry on "Banking" in Encyclpaedia Britannica, 1824 supplement vol. 3? It is initialled FF., but someone scribbled on the issue of which I have a copy "James Mill" (I haven't been able to get hold of a complete bibliography of JM to check whether it's listed. He did, however, contribute a number of entries to the Britannica, including this suppement, so it's not unlikely).
>
> Thank you very much in advance.
>
> Daniele Besomi

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KEVIN D. HOOVER
Professor of Economics and Philosophy
Duke University 

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