The book "National Theater of New Germany. Treatise on Reforms" by the famous Austrian actor and theater director Eduard Devrient offers to pay tribute to the importance of the theater in society and to suggest ways to improve it. The author analyzes the current state of the theatrical business in Germany and makes proposals for the introduction of new methods and techniques into the theatrical process. In his work, Devryent examines in detail the issues of acting, stage decor, direction and the influence of theater on the audience. This book has become a guide for many theater workers and researchers who are interested in the further development of modern theater.