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Darwin Correspondence Project
1876::04::30 in date [X]
1876::04::30 in date [X]
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To J. S. Burdon Sanderson   30 April [1876]


Suggests JSBS’s new machine for observing arterial action be used to test CD’s hypothesis that blushing is caused by thinking intensely about a part of the body and thus releasing the arteries.

Author:  Charles Robert Darwin
Addressee:  John Scott Burdon Sanderson, baronet
Date:  30 Apr [1876]
Classmark:  University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-01)
Letter no:  DCP-LETT-10485

From Margaret Frankland’s diary   30 [April 1876]


[Entry describing a Sunday morning call [see 10480a] during which CD witnessed the behaviour of a bullfinch and a canary in eating parts of some primroses and cowslips.]

Author:  Margaret Frankland
Addressee:  Charles Robert Darwin
Date:  30 [Apr 1876]
Classmark:  Mrs Bucknall (private collection)
Letter no:  DCP-LETT-10485A

To Francis Darwin   [30 April 1876]


CD has just had an interview with Edward Frankland, who "almost laughs" at FD’s idea of getting potash and soda out of the soil by treating it with sulphuric acid. Asks FD to send him a soil sample to give to Frankland. Sends enclosures giving address and labels for soil samples.

Author:  Charles Robert Darwin
Addressee:  Francis Darwin
Date:  [30 Apr 1876]
Classmark:  DAR 271.4: 10
Letter no:  DCP-LETT-10485B