 Although the result is not always praised today, his edition is useful to researches as he had access to manuscripts that have since been lost.In 1990, Oxford University Press published a critical edition, separating the series of lectures and presenting them as independent units on the basis of a complete re-editing of the sources by Walter Jaeschke.This English translation was prepared by a team consisting of Robert F. Brown, Peter C. Hodgson, and J. Michael Stewart, with the assistance of H. S. Harris.