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Sayce, A. H. in correspondent 
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From:
Charles Robert Darwin
To:
Archibald Henry Sayce
Date:
28 July 1877
Source of text:
Bodleian Libraries, Oxford (MS. Eng. lett. d. 63, fols. 51–2)
Summary:

Thinks "mum" comes from shutting the mouth repeatedly as a sign of wanting to eat.

Contributor:
Darwin Correspondence Project