Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 70: Head of the Laocoön of Rome, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79661

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 20: Profound suffering, with resignation, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79639

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 3: The face of an old man… photographed in repose., [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79640

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 42: Gaiety expressed by the ideas of lustfulness, cynicism, and lewdness., [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79665

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 10: Showing the expressive lines of m. frontalis in a young girl, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79641

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 73: Head of Niobe, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79642

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 16: Expression of severity, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79643

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 21: Painful recollection and recollection or calling something to mind, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79644

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 19: Suffering, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79645

Duchenne & Adrien Tournachon, 1854-1856 (taken) 1862 (print), Figure 36: Scornful laughter and scornful disgust, [Mécanisme de la physionomie humaine, ou analyse électrophysiologique des passions], Albumen silver print, from glass negative, Metropolitan Museum of Art, LL/79664