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Sendet die vier Briefe d'Altons an Baer zurück, legt fünf Gegenbriefe Baers (darunter ein Fragment) bei. Fragt nach dem ersten persönlichen Zusammentreffen der beiden und einer weiteren Briefstelle. Fragt nach der Korrespondenz des jüngeren d'Alton mit Baer, gerade was den Tod des älteren 1840 betrifft. Wundert sich, dass damals weder die Akademiezeitschrift der Leopoldina noch die "Isis" von Oken einen Nachruf brachten. Fragt nach Rosmali und dessen Nachlass. Der greise Professor Erdmann habe ihm Aphorismen über d'Alton gebracht. Dankt für die Adresse der Herren Pander in Riga, bislang erhielt er keine Antwort. Hofft auf eine Anfrage an die Petersburger Akademie zu Pander und bittet um Angabe einer Bezugsperson dort. 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