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Die zur Ansicht gesandten Vögel habe er zurückerhalten, nicht aber die Malereien der beiden Sterna. Erbittet diese zurück, da er sie nun benötige. Baer habe nun das Museum der Akademie unter seinen Händen, Dubletten seien immer willkommen. Der hiesigen Sammlung fehlten noch alle osteuropäischen und nordasiatischen Tiere, er sei dankbar, wenn Baer ihm zu dem einen oder anderen Präparat verhelfen könnte. Erbittet Nachrichten über Baers momentane Stellung und das Museum. Er hätte Lust, einmal St. Petersburg zu besuchen und seine naturhistorischen Anstalten kennen zu lernen. Baers Rede über die Akademie habe er mit Interesse gelesen. Bittet, seinen ehemaligen Kollegen Mandt, den Leibarzt der Großfürstin Helena, zu grüßen. Ebenso bittet er um Grüße an Brandt, dessen Abhandlung über Holothurien ihm Freude gemacht habe. 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