First edition.
Our copy is preserved in its original wrappers, under a provisional violet paper cover.
A vertical crease runs through the entirety of the booklet.
Inscribed and signed by Lambert-Adolphe Quetelet to Edmond Becquerel at the head of the title page.
A naturalist, mathematician, and astronomer, Lambert-Adolphe Quetelet (1796–1874) was the founder of the Brussels Observatory.