From the collections of the Regional Museum in Teplice, a thematically homogeneous collection of five codices, probably coming from the last third of the 17th century, was digitised in 2019. One of the manuscripts is written in Latin and contains ‘statuta philosophorum incognitorum’ and an unfinished copy of leafs written by the alchemist Michael Sendivogius; the others mostly use French and comprise sets of alchemical, medical, chemical, technical, and other guidelines and procedures. All codices are connected with the stay and activities of the alchemist Bartolomeus Mencelius at the castle in Teplice in the last third of the 17th century, after which they became part of the castle library of the Clary-Aldringen family.