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Falls es bereits Abbildungen gebe, bitte er um Literaturhinweise, bekannt seien ihm die von Middendorff gesammelten Pflanzen, die Göppert veröffentlicht habe. Sollten seitdem in Nordostsibirien welche aufgefunden worden sein, was er auf Grund der dort vorkommenden Steinkohlen vermute, bitte er um Mitteilung. Die Lektüre von Baers Reden (Reden und kleine Aufsätze vermischten Inhalts, Bd. 1, St. Petersburg 1864) habe ihm einen grossen Genuss verschafft, vor allem, dass Baer dem eiskalten alles Geistesleben verachtenden Materialismus so offen entgegentritt, zumal Baer mit seinen früheren embryologischen Arbeiten von allen bislang am tiefsten in das verborgene Schaffen der Natur eingedrungen sei. Auf seinen gerade verstorbenen Freund Gaudin habe die Lektüre einen erhebenden Eindruck gemacht. Keller habe eine neue Lieferung seiner Untersuchungen über Pfahlbauten herausgegeben und Teile seiner Arbeiten dazu benutzt. 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