Chevreul, Michel Eugène. (1786–1889) [Nadar, Paul. (1856 - 1939)] Original PhotographOriginal photograph of the important French chemist whose work influenced several areas in science, medicine, and art, and evidently related to the important 1886 photographic series by Paul Nadar "L'entretien de M. Nadar avec M. Chevreul." This unsigned gelatin silver print printed somewhat later. Prominent silvering, crease to lower right corner, else fine. Photograph 4 x 5. 75 inches (10. 2 x 14. 6 cm.); matted to an overall size of 13. 6 x 16