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3 volumes. [4], 385; viii, 479, [1]; [4], 414 pp. 24.5x15.5 cm (9¾x6"), later half morocco & cloth, spines lettered in gilt, raised bands, marbled endpapers. First Edition.

Mathematician, theoretical physicist and philosopher Henri Poincaré (1854-1912) was ‘the mathematician who after Newton did the most remarkable work in celestial mechanics... Poincaré inaugurated the rigorous treatment of celestial mechanics, in opposition to the semi-empirical computations that had been prevalent before him. However, he was also keenly interested in the 'classical' computations and published close to a hundred papers concerning various aspects of the theory of the solar system, in which he suggested innumerable improvements and new techniques" (DSB). Most of his results were developed in these three volumes.