Frerichs’s classic monograph on diseases of the liver summarized the existing knowledge and included his own important work on the subject. He discovered leucine and tyrosine in the liver in acute yellow atrophy (Dtsch. Klin., 1855, 7, 341-43), a condition to which he devoted much study. Frerichs was Professor of Pathology at Berlin and enjoyed a great reputation; more than any other man he was responsible for the development of scientific teaching in Germany. English translation, London, 1860.