Originally published in 1984. Paul Henri Thiery, Baron d'Holbach (1723-1789), was the center of the radical wing of the philosophers. Holbach wrote, translated, edited, and issued a stream of books and pamphlets, often under other names, that has made him the despair of bibliographers but has connected his name, by innuendo, gossip, and association, with most of what was written in defeense of atheistic materialism in late eighteenth-century France.