Summary

Thanks for MS observations on expression. Discusses hair standing on end in terror and rage. Asks JC-B to observe contraction of platysma myoides. "Your description of the grinning and exposure of the canine teeth under furious rage is excellent. I presume that you would not object to my quoting it." Asks about contraction of "grief muscles". Comments on blushing. Offers to send book by G. B. A. Duchenne [Mécanisme de la physionomie humaine (1862)].

Summary

Thanks for information about expression.

Comments on JC-B’s photographs of insane people.

Sends copy of Duchenne [see 6755].

Asks for further information about platysma, his bête noire for a year or two.

Summary

Discusses the bristling of hair in melancholics and the action of the platysma myoides muscle and the grief muscles in the insane.