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Darwin, C. R. in correspondent 
Cobbold, T. S. in correspondent 
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From:
Charles Robert Darwin
To:
Thomas Spencer Cobbold
Date:
9 Aug [1869]
Source of text:
Cobbold 1885, p. 174
Summary:

Offers TSC specimens of parasitic worms collected by CD in S. America.

Contributor:
Darwin Correspondence Project
From:
Thomas Spencer Cobbold
To:
Charles Robert Darwin
Date:
1 Sept [1869]
Source of text:
DAR 161: 190
Summary:

Thanks CD for parasitic worms [see 6858] specimens. Supports "fact of succession".

Contributor:
Darwin Correspondence Project