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Wood, John in correspondent 
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From:
John Wood
To:
Charles Robert Darwin
Date:
6 Apr 1871
Source of text:
DAR 87: 145–6
Summary:

Corrects CD on his assertion that the platysma myoides "cannot voluntarily be brought into action" [Descent 1: 19].

Contributor:
Darwin Correspondence Project
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From:
John Wood
To:
Charles Robert Darwin
Date:
11 Apr 1871
Source of text:
DAR 181: 141
Summary:

Emotional states leading to contraction of the platysma. Contraction of skin muscles.

Contributor:
Darwin Correspondence Project
From:
John Wood
To:
Charles Robert Darwin
Date:
19 Apr 1871
Source of text:
DAR 181: 142
Summary:

Movement of hair; action of occipito-frontalis muscle.

Contributor:
Darwin Correspondence Project