* In fact, Engels did not live to commence this task, which’ was begun only after his death by Karl Kautsky. Theories of Surplus-Value was first published, in a rather unsatisfactory edition, in 1905.

† The Jahrbücher für Nationalökonomie und Statistik was a fortnightly magazine produced in Jena from 1863 to 1897. It was edited by Joseph Conrad from 1872 to 1890 and subsequently by Wilhelm Lexis.