Based on sources from 1639 and 1640 which are commented in detail, the latest volume of the edition documents the linguistic, literary and cultural projects of that time of the Fruitbearing Society in the context of the military, diplomatic and social developments of the Thirty Years' War. In the wide spectrum of different topics , the book focuses on the Fruitbearing Society's peace propaganda, the debate concerning a basic German grammar and poetics, the new translation of the Bible into German and Martin Opitz' seminal work on historical German philology.