From J. V. Carus   29 January 1873

My dear Sir,

Again I trouble you   A new edition of the Expression of the Emotions is to be done¹   So I beg to ask you, if you have anything to add or to alter or if you have in any way a particular wish.

There is a litterary notice, which I thought you might like to get. You mention that “Gratiolet remarks, whenever our attention is long concentrated on any subject we forget to breathe” (Expression, p 179).² May I draw your attention (without interrupting your breathing) to an article of Nasse in Meckel’s Deutsches Archiv für Physiologie, Bd. 2. 1816. p. 1. “on the want of respiration during mental occupations”, which contains some observations of great interest, stating the same as Gratiolet.³

Hoping that your health may be pretty good I remain | Ever yours sincerely | J. Victor Carus