He published several pieces bearing on medicine, astrology and alchemy, and attacking the system of Paracelsus.
So far as the numerous works are concerned it is evident that the writers who posed as Rosicrucians were moral and religious reformers, and utilized the technicalities of chemistry (alchemy), and the sciences.
The Development of Chemistry in Recent Times appeared in 1871-1874, and in 1886 he published a work in two volumes on Alchemy in Ancient and Modern Times.
Tycho Brahe was from his fifteenth year devoted to astrology, and adjoining his observatory at Uranienburg the astronomerroyal of Denmark ha .d a laboratory built in order to study alchemy, and it was only a few years before his death that he finally abandoned astrology.
Alchemy in this sense is merely an early phase of the development of systematic chemistry; in Liebig's words, it was " never at any time anything different from chemistry."