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Zu ihrem gemeinsamen Freund Odoefsky, der ihm von Baers wissenschaftlicher Tätigkeit berichtete. Wird im Frühjahr seine Schwester nach Petersburg begleiten. Hat im vorigen Sommer die Pyrenäen bereist und den Pic Maladetta bestiegen. Seit 1700 Jahren hätten sich hunderte Naturforscher vergeblich bemüht. Hat seine Beobachtungen der französischen Akademie mitgeteilt, Arago schienen sie nicht ganz zu mißfallen. Er wisse noch nicht, wo sein Bericht gedruckt werde, will etwas der Petersburger Akademie mitteilen. Bei Odoefsky könne Baer einen französischen Zeitungsartikel lesen. Sein Bruder werde vor seiner Abreise nach Sibirien Baers Bekanntschaft gemacht haben. Hofft auf gute wissenschaftliche Resultate der Reise. Selbst wolle er im Winter nach Paris, um sich in Geodäsie und hypsometrischen Operationen zu üben. Gruß an Cancrin junior und Helmersen. Zu zwei Barometern, die er bei Jürgenson hinterlassen hat sowie zwei Chronometern bei Struve in Polkowa. 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