His son, GEORG ADOLF ERMAN (1806-1877), was born in Berlin on the 12th of May 1806, and after studying natural science at Berlin and Konigsberg, spent from 1828 to 1830 in a journey round the world, an account of which he published in Reise urn die Erde durch Nordasien and die beiden Ozeane (1833-1848).
His earlier papers were mostly concerned with crystallography, and the reputation they gained him led to his appointment as Privatdozent at Konigsberg, where in 1828 he became extraordinary, and in 1829 ordinary, professor of mineralogy and physics.
He retired from his professorship in 1876, and died at Konigsberg on the 23rd of May 1895.
Keller, Memel, Pregel and Weichselstrom (2 vols., Berlin, 1900); and Schickert, Wasserwege and Deichwesen in der Memelniederung (Konigsberg, 1901).
Sage (Konigsberg, 1889).
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