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ABSTRACT THE subject of celestial mechanics is dis-JL tinguished alike by the profound difficulty and the beauty of its problems. For more than two centuries it has been the object of
research on the part of the most eminent mathematicians. Its literature, both in the form of theoretical and critical studies and of the most extensive practical calculations ever
undertaken, is vast. For the most part the memoirs naturally presuppose a general familiarity with established methods and are concerned with special phases of the subject. They will always
leave room for the treatise aiming at a more introductory and systematic exposition. It may appear that in a field so intensively cultivated certain classical lines would have become firmly
established, to the exclusion of any fresh and original treatment; that the possibilities open to the writer of a new treatise would have been largely exhausted. That would be to undervalue
the richness of the field completely. We are certainly fortunate in the possession of several such systematic treatises, of the highest quality. But when they are brought together, in all
languages, they make no excessive number. It is probably safe to assert that no other branch of science is so completely free from superfluous works of this kind. Nor is the reason far to
seek. There is no mercenary incentive to their production, and the only motive must be allied with sincerity of purpose. (1) Cours de mécanique céleste. Par Prof. H. Andoyer. Tome 1. Pp. vi
+ 439. (Paris: Gauthier-Villars et Cie, 1923.) 50 francs. (2) Cours d'astronomie. Faculté des Sciences de Paris. Par Prof. H. Andoyer. Première partie: Astronomie théorique. 3e édition
entiérement refondue. Pp. iii + 455. (Paris: J. Hermann, 1923.) 35 francs. (3) Grundriss der theoretischen Astronomie und der Geschichte der Planetentheorien. Von J. Frischauf. Dritte
vermehrte Auflage. Pp. xvi + 248. (Leipzig: Wilhelm Engelmann, 1922.) Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution
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about institutional subscriptions * Read our FAQs * Contact customer support Authors * H. C. P. View author publications You can also search for this author inPubMed Google Scholar RIGHTS
AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE P., H. (1) Cours de mécanique céleste (2) Cours d'astronomie Faculté des Sciences de Paris (3) Grundriss
der theoretischen Astronomie und der Geschichte der Planetentheorien. _Nature_ 112, 644–646 (1923). https://doi.org/10.1038/112644a0 Download citation * Issue Date: 03 November 1923 * DOI:
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