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From John Wood   6 April 1871

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Summary

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

Author:  John Wood
Addressee:  Charles Robert Darwin
Date:  6 Apr 1871
Classmark:  DAR 87: 145–6
Letter no:  DCP-LETT-7661

From John Wood   11 April 1871

Summary

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

Author:  John Wood
Addressee:  Charles Robert Darwin
Date:  11 Apr 1871
Classmark:  DAR 181: 141
Letter no:  DCP-LETT-7674

From John Wood   19 April 1871

Summary

Movement of hair; action of occipito-frontalis muscle.

Author:  John Wood
Addressee:  Charles Robert Darwin
Date:  19 Apr 1871
Classmark:  DAR 181: 142
Letter no:  DCP-LETT-7699
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