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Darwin, C. R. in correspondent 
1860-1869::1863::04 in date 
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From:
Hermann Crüger
To:
Charles Robert Darwin
Date:
23 Apr 1863
Source of text:
DAR 161: 276, DAR 205.8: 68 (Letters)
Summary:

Observations on Catasetum.

Figs require insects in order to set seed.

Contributor:
Darwin Correspondence Project