Plate 31: Slightly Stronger Electrical Excitation of the Zygomaticus Major: Fake Laughter, from Chap. 6: "Muscles of Joy and Benevolence," in Icono Photographique: Mécanisme de la Physionomie Humaine (Photographic Icon: Mechanism of Human Physiognomy)

before 1857 (negative), published 1862

Medium	albumen print
Dimensions	image: 4 3/4 x 3 9/16 in. (12 x 9.1 cm) sheet: 10 13/16 x 7 1/16 in. (27.5 x 18 cm)
Object Number	1999.26
Acquisition	Acquired by the Clark, 1999
Status	Off View

Image Caption

Guillaume-Amant Duchenne de Boulogne, Plate 31: Slightly Stronger Electrical Excitation of the Zygomaticus Major: Fake Laughter, from Chap. 6: "Muscles of Joy and Benevolence," in Icono Photographique: Mécanisme de la Physionomie Humaine (Photographic Icon: Mechanism of Human Physiognomy), before 1857 (negative), published 1862, albumen print. Clark Art Institute, Acquired by the Clark, 1999.26