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Rh throughout the book, and I have added occasional notes referring to works which have appeared since its first publication. These are distinguished by brackets. I have not, however, given a false appearance of novelty by altering references to suit recent editions, except in a few instances, such as the second edition of Prantl's Geschichte der Logik im Abendlande, and Mr. Webb's edition of the Policraticus. Nor have I changed the plan of naming the place of publication of books quoted, except when English, French, and German works were published at London, Paris, and Leipzig; and of specifying their size, when it was anything but octavo. References to Bouquet are to the Recueil des Historiens des Gaules et de la France; those to Pertz indicate the folio series of Scriptores in the Monumenta Germaniae historica, and those to Jaffé to the Bibliotheca Rerum Germanicarum. In citations of manuscripts b denotes the verso of the leaf; but when a manuscript is written in double columscolumns [sic] A, B, and C, D denote respectively the two columns of recto and verso.

R. L. P.


 * Oxford,
 * 24 October, 1920.