Explanation of facial expressions and muscles used

Unknown artist

Lettering: Explanation of pathognomy, or the signs of the passions. ... Lettering continues: "Pathognomy includes, not only the expression given to the face by the violent action of certain muscles in the moment of excitement, but also a general conformity at all times suiting the exhibition of particular passions, by a strength and mobility of some muscles; a smoothing or swelling of others; by their sinking & contraction; by their appearance and imperceptibility, and by their inundation ..." [continues extensively]