
First edition, printed in very small numbers, of this offprint from the Bulletins de l'Académie royale de Belgique, 3rd series, vol. IV, no. 12.
No copy in the CCF. A single copy in Worldcat.
Traces of a label and of a distribution stamp in the left margin of the upper cover, a few small spots of foxing.
The physicist Charles Montigny (1819-1890) was director of the science section of the Académie royale des Sciences et Belles-Lettres de Bruxelles, of which he had been a member since 1867.
Inscribed by Charles Montigny to Admiral Ernest Mouchez (1821-1892), a specialist in hydrological and astronomical observations, director of the Paris Observatory from 1878.