This book is a treatise on natural law and the duties of individuals as citizens. It is written in Latin and consists of two main parts: the first provides an overview of natural law theory and its application to human society, while the second discusses the specific duties and obligations of citizens. The book has been influential in the development of political philosophy and is an important work for anyone interested in the history of political thought. 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.