His French thesis for the doctorate of letters, Etude sur les pamphlets politiques et religieux de Milton (1848), showed that he was attracted towards foreign history, a study for which he soon qualified himself by mastering the Germanic and Scandinavian languages.
étude הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד