He produced: "Chemical Research on Various Varieties of Pus" (Berlin 1842); "Chemical Research on the Bones and Teeth of Humans and Other Vertebrates" (Schweinfurt 1844) and "Helpful Tables for the Recognition of the Substances of Zoological Chemistry" (Erlangen 1846). Then in cooperation with Geist he published: "Investigations of the Diseases of the Workers in the Phosphorus Match Factories" (Erlangen 1847) as well as with Harleß "The Events of the Investigations of the Effects of Sulphur Fumes" (Erlangen 1847). After he had published "Chemical Fragments Concerning the Liver and Gall-Bladder" (Braunschweig 1849), he went to Brazil and around Cape Horn. He reported on this trip in his "Trips in South America" (Mannheim 1854, 2 vols.). After his return he lived mostly in Nuremberg where he also set up his rich collections of natural history ethnographics and died on 5 June 1878. Here he published "Comparative Investigations of the Human Brain and Those of Other Vertebrates" (Mannheim 1854); "The Narcotic Substances of Enjoyment and the Human Being" (Nuremberg 1855); "Bread and the Various Grains" (Nuremberg 1860); "Coffee and its Substitute" (Reports at the Meetings of the Academy of Sciences in Munich, 1858); "The Bronze and Copper Alloys of the Old and Most Ancient Peoples" (Erlangen 1869) and "Concerning Old Discoveries of Iron and Silver " (Nuremberg 1873).