in Ebstein and Schwalbe's Handbuch der praktischen Medizin, in Verbindung mit Zahlreichen Gelehrten.
In the 1870s, with Wilhelm Ebstein (1836–1912), he performed important research involving the physiochemical behavior of pepsin in the digestive tract.
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Some of his better known assistants and students included Paul Ehrlich (1854–1915), Adolf Weil (1848–1916), Paul Langerhans (1847–1888), Bernhard Naunyn (1839–1925), Heinrich Irenaeus Quincke (1842–1922), Friedrich Albin Hoffmann (1843-1924), Wilhelm Ebstein (1836–1912) and Hugo Rühle (1824–1888).