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Published online by Cambridge University Press: 27 February 2009
1 This is my own collation of the manuscripts in Merton College, Oxford (no. 278, abbreviated M); Balliol College, Oxford (no. 252, abb. B); University Library, Cambridge (Dd. 4. 30; Ii. 3. 16, abb. D and I respectively).
2 Pp. 112/113 (Arabic notation). I gratefully acknowledge a photostat of this passage from Dr. J. Mattock of Glasgow University, who is about to edit the manuscript.