5 Pages in Charles Darwin's Library associated with "mental states - agony"

The anatomy and philosophy of expression
By: Bell, Charles, Sir,
Publication info: London, John Murray, 1844
Pages: Page 91 Page 102 Page 139
De la physionomie et des mouvements d'expression
By: Gratiolet, Pierre,
Publication info: Paris, J. Hetzel, 1865
Pages: Page 104 Page 105