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Walker, W. G. in correspondent 
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From:
William Gregory Walker
To:
Charles Robert Darwin
Date:
21 Aug 1873
Source of text:
DAR 181: 4
Summary:

African elephants cry when distressed.

Contributor:
Darwin Correspondence Project
From:
William Gregory Walker
To:
Charles Robert Darwin
Date:
6 Dec 1874
Source of text:
DAR 181: 5
Summary:

On voluntary vomiting. Dogs re-swallow vomited food.

Contributor:
Darwin Correspondence Project