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Ross, James in correspondent 
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From:
James Ross
To:
Charles Robert Darwin
Date:
Sept 1874
Source of text:
DAR 176: 217
Summary:

Sends his book [On protoplasm (1874)], which defends CD’s theory.

Suggests why the lips are closed and the teeth clenched in the expression of determination: it originated as a means of protecting jaw-bone and teeth against a strong blow.

Contributor:
Darwin Correspondence Project