 After a brief sojourn in Germany, Bopp travelled to London where he made the acquaintance of Sir Charles Wilkins and Henry Thomas Colebrooke.He also became friends with Wilhelm von Humboldt, the Prussian ambassador at the Court of St. James's, to whom he taught Sanskrit.He brought out, in the "Annals of Oriental Literature" (London, 1820), an essay entitled "Analytical Comparison of the Sanskrit, Greek, Latin and Teutonic Languages" in which he extended to all parts of grammar what he had done in his first book for the verb alone.