In Freiberg, he remained active with his literary work. It was at this time that he began a collection of notes for a project to unite the separate sciences into a universal whole. In this collection, "Das allgemeine Brouillon (Notes for a General Encyclopedia)", Novalis began integrating his knowledge of natural science into his literary work. This integration can be seen in an unfinished novel he composed during this time, "Die Lehrlinge zu Sais" ("The Novices at Sais"), which incorporated natural history from his studies as well as ideas from his Fichte studies into a meditation on poetry and love as keys to understanding nature. More specifically, he began thinking about how to incorporate his recently acquired knowledge of mining to his philosophical and poetic worldview. In this respect, he shared a commonality with other German authors of the Romantic age by connecting his studies in the mining industry, which was undergoing then the first steps to industrialization, with his literary work. This connection between his scientific interest in mining, philosophy and literature came to fruition later when he began composing his second unfinished novel, "Heinrich von Ofterdingen".