"Marking a major development in Foucault's thinking, this book derives from the lecture course which he gave at the College de France between January and April, 1978. Taking as his starting point the notion of "bio-power," introduced both in his 1976 course Society Must be Defended and in the first volume of his History of Sexuality, Foucault sets out to study the emergence of this new technology of power over population."--Jacket.