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Schickt ihm eine Kiste mit Vögeln und Säugetieren. Auflistung der Präparate mit Preisen. Die Kiste enthält auch zwei Pakete mit Schriften, die er an die Adressaten weiterleiten soll. Wegen den Säugetieren habe er nach Neuchatel geschrieben und melde sich, sobald er Tauschpreise habe. Schickt seinen Conspectus avium (Avium conspectus quae in Republica Peruana reperiuntur et pleraeque observatae vel collectae sunt in itinere a J. J. de Tschudi, Berlin 1844). Zur Nomenklatur in der Ornithologie, hat sich teils an Brisson'sche Namen gehalten. Bedauert, Baers Brief nicht eher erhalten zu haben, sonst hätte er ihm diverse Naturalien senden können, die er jetzt nicht mehr habe, auch etwas von Sundevall. Die Myriapoden bearbeite Dr. Stein für seine Fauna. Schickt demnächst die Mumie eines Kindes an die Akademie, ferner zwei Schädel vom Stamme der Chinchas. Bittet Baer um einen kleinen Rapport über diese Objekte an die Akademie. 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