9 Pages in Charles Darwin's Library associated with "mental states - attentiveness"

De la physionomie et des mouvements d'expression.
By: Gratiolet, Pierre.
Publication info: Paris :J. Hetzel,1865.
Pages: Page 230 Page 232 Page 233 Page 234 Page 254 Page 283 Page 322
Wissenschaftliches System der Mimik und Physiognomik.
By: Piderit, T.
Publication info: Detmold :Klingenberg,1867.
Pages: Page 88 Page 92