'Sariský spevnik' (Saris song-book) has been so far by the scholars referred to as 'Moskovsky spevnik' (Moscow song-book) - according to the place of its storage. This song-book is usually mentioned in a connection with a song entitled 'Dina Rusnaci' in which the relationships between the Slovak and the Rusin ethnica are reflected. The song is also included in the appendix to Jan Kollar's 'Narodnie spievanky' (Folk songs) from 1835. Saris song-book is at present preserved in the Lomonosov Moscow State University Library. It was A. Petrov who made a mention of its existence for the first time. He drew the attention of the scholars to the fact that the song-book originated in Eastern Slovakia. An extensive description was published by Frantisek Tichý. The Saris song-book consists of 208 folios. The song-book was created by the way of a successive addition of the individual folios of a diverse quality dating back to the beginning of the 18th century. It. was studied and prepared for edition by F. Tichý in 1929 but apart from an extensive paper from 1931 no edition has been realized so far. In the years 1933-1934, the Saris song-book was studied by V. N. Peretc. But the analysis was published no sooner than 1962. The accent of his study lies on the secular songs. He dated the paper of the song book to the beginning of the 18th century, of course except for the part in which Speranskij found the watermarks from 1730-1733.The song book was written by the several hands but the main part of it is written in cursive script originating from the 1720´s. It contains also the parts written in the Cyrillic semi-uncial script much older than the beginning of the 18th century. The provenance of the Moscow song-book can be undoubtedly determined: it originates from the Eastern Slovakia. Not only the language of individual songs but several marginal records as well attest to this fact. V. N. Peretc could not finish his investigations as he fell into disgrace in the 1930´s and was arrested in 1934. From that time on, the ms. was considered to have been lost. But recently, thanks to the cooperation of Lydia Sazonova, a member of the Russian Academy of Sciences, the Saris song-book has been found and identified again. Now, a digitalized copy of it is a part of the database in the Jan Stanislav Institute of Slavistics in Bratislava, thanks to the support of Alexander von Humboldt-Stiftung and prof. Hans Rothe.