"Memorial on the unification of three services: horse mail, mail and courier services under one administration" is an interesting and important work, because it illuminates the process of unification of three key services in France in the 19th century. The author highlights how the unification of postal services under one management ensures more efficient and convenient operation of the system, contributing to the improvement of service to citizens. The work of M. Fenis is an important contribution to the study and optimization of the postal economy, which helps to better understand the history of the development of the postal business in this period.