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From J. O. Westwood   26 September 1861

Summary

Has found the reference to Charles Morren’s paper, "On the agency of insects in causing sterility in flowers" [Proc. R. Entomol. Soc. Lond. 1 (1836): xliv–xlv].

Common white butterflies remove pollen-masses with their tarsi from plants of the Asclepiadaceae.

Author:  John Obadiah Westwood
Addressee:  Charles Robert Darwin
Date:  26 Sept 1861
Classmark:  DAR 181: 89
Letter no:  DCP-LETT-3267

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