In 1819, he left Stockholm for St. Petersburg, Russia, where he wrote the paper "The Languages and Literature of Norway, Iceland, Sweden and Finland," which published in German in the sixth volume of the Vienna Jahrbücher.
Desde Estocolmo, marchou, en 1819, para San Petersburgo, onde redactou, en alemán, un artigo sobre "As linguas e as literaturas de Noruega, Islandia, Suecia e Finlandia", no número 6 da Vienna Jahrbücher.