Pasteur, Louis. Highly important photograph inscribed and signed (“L. Pasteur”) by Pierre Petit undated but inscription dated 1 January 1869, (14 x 11 in.; 355 x 279 mm.) including mount, an albumen print, shaped to a large oval on a tan mount with Petit’s blind stamped logo at base; light spotting, foot of mount with light damp staining at right and razor cut at left.
From one scientist to another. A large portrait of Pasteur, seated, with one arm resting on the arm of a chair. The great scientist inscribes the lower left portion of the mount in dark ink: “A mon ancien et bon comarad, J. Marcou/Sounvenir affectueux/ca 1er janvier 1869/L. Pasteur.” Jules Marcou was a French geologist, professor of mineralogy at the Sorbonne and later professor of paleontology in Zurich. He travelled in America with Louis Agassiz, the Swiss zoologist and settled in Cambridge, Massachusetts where he resided until his death. Pasteur, himself a professor of geology at the École des Beaux-Arts, and Marcou had no doubt been colleagues in Paris. Photographs inscribed by Pasteur, especially from this relatively early period of his career are extremely rare.