The book "To the illustration of the ancient and modern languages, in particular Italian, which was promoted in the 18th century by the Italians. Part I" is published under the authorship of Cesare Lucchesini, a famous Italian linguist and philologist. This book examines the important phenomenon of the Italian language and its development in the 18th century under the watchful eye of Italian scholars. The author examines in detail both the use of language and the methods by which the process of illustrating and studying languages took place. In his work, Cesare Lucchesini discusses important aspects of language evolution and linguistics in Italy in the 18th century. The book is a valuable resource for those interested in the history of languages and the study of linguistics. It will help the reader better understand the role of the Italian language in the world context and evaluate the contribution of Italian scientists to the development of linguistics.