[August Constantin].  German linguist, born in Breslau on the 26th of September 1819. After several years’ connection with various military schools and other establishments during a long residence in St. Petersburg, he returned to Germany and became, in 1864, professor of Russian at the University of Bonn. Shortly afterward he published a New Course in the Russian Language, and followed it by similar manuals of the English, Spanish, Italian, and French languages. Language and Its Life, and Introduction to the Study of Sanskrit according to the Latin Inscriptions, are among his other publications. He edited numerous translations of classical writings.