The documents of this collection set out the main problems of the Jesuit mission in Russia under Peter I: financial difficulties, difficulties of a propaganda sense and the private life of members of the Order up to 1720. Due to the secret status of the letter, often, sometimes for a whole year, could not be sent as intended. The publication of the book was facilitated by F. Dvorsky, assistant archivist of the Zemstvo archive in Prague, who in 1883 proposed to the Archaeographic Commission copies of documents he had made concerning Catholic propaganda in Moscow, mainly letters from the Jesuits, the end of the 17th and first quarter of the 18th centuries. The texts are given first in Russian, and in the second part of the book in the original language.