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Main, William in correspondent 
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From:
Charles Robert Darwin
To:
William Main
Date:
29 Nov [1872]
Source of text:
Wellcome Collection (MS.7781/1–32 item 10)
Summary:

Thanks WM for his letter. CD does not think WM’s principle of [up-tending and down-tending] lines explains the cases of expression of emotions referred to, and, even if it did, the problem would remain as to why the lines should express what WM believes they do.

Contributor:
Darwin Correspondence Project
From:
William Main
To:
Charles Robert Darwin
Date:
26 Nov 1872
Source of text:
DAR 171: 27
Summary:

Has read a review of Expression and finds CD’s explanation of "antithesis" [see Expression, p. 50] unsatisfactory. Proposes a theory of upward lines expressing energy and downward lines expressing the reverse.

Contributor:
Darwin Correspondence Project
From:
William Main
To:
Charles Robert Darwin
Date:
2 Apr 1873
Source of text:
DAR 171: 28
Summary:

Having now read Expression, WM repeats his criticism of "antithesis". Explains his theory of up-and-down-tending lines.

Contributor:
Darwin Correspondence Project