||Original images: 400dpi, color jpg files approx. 4500 by 5800 pixels. Editing: re-sampled to 600dpi, converted to black and white tif files, de-skewed, and set uniform margins. Minimal clean up. Title page carries library stamp of the Bibliothèque Imperiale with stamped date of 1866. On the other hand, Hiélard plates in 1866 were generally in double-digits, suggesting late 1866/early 1867 publication, so publication may have been delayed?
Ah, here. Publication noted in the Bibliographie de la France 2e série, 56e année, Nº 2, 12 Janvier 1867, p.18, r.49.