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Fragt, ob Baer seine Reise ausgeführt habe. Aufgrund der Ausdehnung der Naturgeschichte beschränke er sich auf Wirbeltiere, in Island habe er auch Mollusken und Würmer gesammelt. Von seinen Dubletten will er gerne abgeben und sucht dagegen Belege für seine Eiersammlung. Hofft, durch Baers Vermittlung aus Moskau oder Petersburg Präparate zu erhalten. Zu Baers Aufsatz in den "Notizen" (Ornithologische Fragmente. In: Notizen aus dem Gebiete der Natur- und Heilkunde 10 (1826), Nr. 17, Sp. 259-266, Nr. 18, Sp. 277-280). Zu Brehms Besuch bei ihm. Arbeitet an der Herausgabe einer Zeitschrift zur Vertrebratenkunde, erbittet Baers Unterstützung. Kritisiert Brehms Leistungen als Ornithologe. 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