Eugène Constant, Foro e Colonna di Trajano, 1848–52, Albumen print from glass negative, 11 5/16 × 8 11/16 in. (28.8 × 22 cm), New York, Metropolitan Museum of Art
Constant, who associated with the painter-photographers at the Caffè Greco, was the first in Rome to use the method of albumen on glass plate negatives devised by the Frenchman Niépce de Saint-Victor in 1847. This remarkable album contains thirty prints by Constant, each affixed to a page bearing the blind stamp of the bookseller Edouard Mauche (who sold his views).