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April, den er verspätet beantwortet. Dankt für Rathkes Abhandlungen, lobt seine genauen Beobachtungen, er hätte aber durchaus Savignys (Mémoire sur les animaux sans vertèbres, Paris 1816) Autorität folgen sollen. Leiht das Werk gerne aus, die Übersetzung in der "Isis" habe er nicht verglichen. Dankt für den Seba. Entlegenere Werke könne er gerne verleihen, nur mit Zeitschriften ginge es nicht. Spricht der Naturforschenden Gesellschaft in Danzig seinen Dank aus. Fragt nach Kleins Eiersammlung in Danzig, hier habe er eine für das Museum gekauft, die nach ihm geordnet sei. Die Sammlung habe einem hiesigen Inspektor Lenz gehört. 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