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Darwin Correspondence Project
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1868::04::02 in date [X]
1868::04::02 in date [X]
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To William Bowman   2 April [1868]

Summary

Gives Charles Bell’s explanation of the contraction of the orbicularis during screaming and seeks confirmation of his view because the action is "the key-stone of a whole class of expressions". Curious to learn WB’s conclusion in regard to the relation between contraction of the orbicularis and secretion of tears. Notes that voluntary contraction of the orbicularis causes no tears.

Author:  Charles Robert Darwin
Addressee:  William Bowman, 1st baronet
Date:  2 Apr [1868]
Classmark:  DAR 249: 72 (photocopy)
Letter no:  DCP-LETT-6081

From George Robert Gray   2 April 1868

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Summary

On the changes in plumage of scarlet ibis at the zoo in breeding season.

Author:  George Robert Gray
Addressee:  Charles Robert Darwin
Date:  2 Apr 1868
Classmark:  DAR 84.1: 90–1
Letter no:  DCP-LETT-6082

From Robert Caspary   2 April 1868

Summary

Finds important differences between English and German versions of Variation on graft-hybrids.

Experiments and observations on submerged flowers.

Author:  Johann Xaver Robert (Robert) Caspary
Addressee:  Charles Robert Darwin
Date:  2 Apr 1868
Classmark:  DAR 161: 122
Letter no:  DCP-LETT-6083

To John Bush   2 April [1868]

Summary

Thanks JB for his information. Has heard of analogous cases to JB’s observations on [colours of] crossed rats; the offspring of white and grey mice are stated to be either white or grey and never piebald.

Author:  Charles Robert Darwin
Addressee:  John Bush
Date:  2 Apr [1868]
Classmark:  Private collection
Letter no:  DCP-LETT-6084
Document type
letter (4)
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