 He had been engaged to write a book confuting homeopathy, but upon reading Samuel Hahnemann's works and investigating homeopathy's clinical claims for himself he became convinced of its efficacy, sought out the author, and became his personal friend.They began corresponding in 1824.Later, Hering was treated for a dissecting wound with the homeopathic remedy "Arsenicum album" (white arsenic or arsenic trioxide) and the finger was saved, further provoking his interest.