It was the first big publication of written monuments various in their origin and functions. There are mostly apocrypha: ‘St Paul’s Vision’, ‘Behests of Twelve Patriarchs’, ‘Dream of the Mother of God’, ‘Tale on the Cross Tree’, and a number of texts included into medieval indices of forbidden books or similar to them (fortune-telling books). In the Middle Ages, apocrypha were not treated as sacred books, but many people considered them didactic – not ‘false and forbidden’. Sometimes, P. gave titles to the text prepared for publication. For instance, he used the title ‘Rafli’ for a composition on geomantic fortune-telling with dices (the book ‘Rafli’ had been mentioned quite often in indices of forbidden books of the sixteenth – seventeenth centuries, and in ‘Stoglav’). Even in the early twentieth century the work by P. was criticized for the absence of textual criticism of sources, but the input of P. into studying and publication of apocrypha was great. The published texts are of biggest importance for those who study folk religion, because some of those texts (‘Dream of the Mother of God’, for instance) reflected the so called ‘folk’ or ‘people’ religious mentality.