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Letter of introduction for Henry Deane, who is visiting Vienna.
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Regrets he has no spare copies of a paper Felder has asked for, but will send him his "Notes on Eastern butterflies".
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About corrections he is making on one of Lyell's books.
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Discusses the relationship of the Sub-Order Heterocera within the Order Lepidoptera. Thanks Felder for and congratulates him on his plates of the Heterocera.
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