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1870-1879::1874::10 in date 
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From:
Charles Robert Darwin
To:
John Scott Burdon Sanderson, 1st baronet
Date:
9 Oct 1874
Source of text:
University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-19)
Summary:

Has been testing the digestive powers of Drosera; wants to know whether a group of substances that elicit similar responses are related.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
John Scott Burdon Sanderson, 1st baronet
Date:
13 Oct 1874
Source of text:
University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-20)
Summary:

Discusses the powers of digestion of Drosera and why certain substances produce less excitement in the plant than others.

Contributor:
Darwin Correspondence Project