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From J. S. Burdon Sanderson   3 September [1874]

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Summary

Will prepare experiments with the fatty acids on digestion of gluten. Has found it is digested slowly, but entirely, with pepsin and hydrochloric acid.

Author:  John Scott Burdon Sanderson, 1st baronet
Addressee:  Charles Robert Darwin
Date:  3 Sept [1874]
Classmark:  DAR 58.1: 146
Letter no:  DCP-LETT-9623

From Chauncey Wright   3 September 1874

Summary

Writes at length on the origins and meanings of particular head movements as used to express assent or disagreement, especially the sideways movements of the head as an expression of consideration or contemplation.

Also discusses space and colour perception.

Author:  Chauncey Wright
Addressee:  Charles Robert Darwin
Date:  3 Sept 1874
Classmark:  DAR 181: 172, 173 f. 6
Letter no:  DCP-LETT-9624