The German philosopher, historian, and sociologist Friedrich Albert Lange was born at Wald near Solingen. He studied at Duisberg, in Zürich, where he attended the lectures of a disciple of Johann Gottfried Herbart, and at Bonn. After receiving a degree at Bonn, he taught high school in Cologne, and in 1851 he became a university instructor at Bonn. His dissertation concerned the relation between theories of education and various worldviews. From 1858 to 1861 he taught school in Duisberg but resigned because of a government order forbidding teachers to participate in political agitation. Lange remained in Duisberg as a newspaper editor and secretary of the chamber of commerce. His socialist sympathies were not incompatible with a genius for finance. In 1866 he returned to Switzerland and in 1870 became professor of inductive logic at Zürich. He was appointed to a professorship at Marburg in 1873 and...