Published online by Cambridge University Press: 05 April 2006
* I am much indebted to Ms T. D. Clay for help in the preparation of this paper. It was a privilege in 1999 to have to the opportunity of reading a version of it at Rikkyo University, Japan, under the chairmanship of Prof. Satoshi Urano; it benefited from the help of other Japanese scholars who were present, notably Prof. Mariko Sakurai, and more recently from the advice of Prof. Fabio Faversani, Federal University of Ouro Preto, and Senhor Fabio Duarte Joly, University of São Paulo, Brazil, and from that of the editorial committee.