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Freut sich, wenn er bei Männern vom Fach Anerkennung findet. Zur Benennung der "Nitzschia" (Beiträge zur Kenntniss der niedern Thiere. 4. Nitzschia elegans. In: Nova Acta Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum 13,2 (1827), S. 660-678), dankt für die öffentliche Ehrenbezeugung. Hat den Band noch nicht gesehen und freut sich über die Zusendung von Baers Arbeit, ebenso über die Dissertation über den Maulwurf (A. W. Koch: De talpae Europaeae oculo, Regiomonti 1826). Freut sich über einen Schriftentausch mit Königsberger Dissertationen. Entschuldigt seine späte Antwort, er war zwei Monate in Berlin und fand dann Baers Brief vom Oktober vor. Dann musste er einen Katalog über die Ankäufe des Zoologischen Museums von 1816-1824 vorlegen. Übersendet Geld für ein Strix-Präparat. 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