This book is a collection of letters written by Dr. Joachim Jungius, a prominent scholar from Lübeck, to his students and friends. The letters offer a fascinating window into the intellectual and cultural life of seventeenth-century Germany, and they shed light on many important topics such as philosophy, theology, and natural science. This is a must-read for anyone interested in the history of ideas. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.