Editor’s notes: The text was adapted for the web, as a digital archive, by Foucault.info in 1999 from photocopies of the verbatim transcription of the lectures by J. Pearson, consulted at the Bibliothèque du Saulchoir in Paris. The footnotes and bibliography added by J.Pearson were not included. In 2006, the text was proofread and reorganised into six ﬁles for better readability on screen.