German physician; born at Bunzlau, Silesia, Oct. 28, 1839; educated at the universities of Breslau, Vienna, and Berlin (M.D. 1860). In 1861 he took charge of a private insane asylum at Pankow, near Berlin. He served as surgeon in the Franco-Prussian war (1870-71), and gained the Iron Cross. In 1873 he removed to Berlin and became privat-docent in psychiatry at the university, and in 1884 was made assistant professor. From 1877 to 1881 he was a member of the German Reichstag.
Mendel is collaborator in psychiatry on Eulenburg's "Realencyclopädie der Gesammten Heilkunde," Ebstein-Schwalbe's "Handbuch der Praktischen Medizin," and Tuke's "Journal of Mental Science." He has written many essays in the medical journals, especially on psychiatry, and is editor of the "Neurologisches Centralblatt" and of the "Jahresbericht über Neurologie und Psychiatrie." Of his numerous works may be mentioned: "Progressive Paralyse der Irren," Berlin, 1880; "Die Manie," Vienna, 1881; and "Die Geisteskranken in dem Entwurf des Bürgerlichen Gesetzbuches für das Deutsche Reich," Berlin, 1889.