In 1852 he became lecturer in medicine at the University of Tübingen , where he published his magnum opus `` Kraft und Stoff : Empirisch-naturphilosophische Studien '' ( Force and Matter : Empiricophilosophical Studies , 1855 ) .
In 1852 he became lecturer in medicine at the University of Tübingen , where he published his great work `` Kraft und Stoff : Empirisch-naturphilosophische Studien '' ( Force and Matter : Empiricophilosophical Studies , 1855 ) .