PREFACE. THE rapid progress of discovery in the zone of minor planets, the anomalous forms and positions of their orbits, the small size as well as the great number of these telescopic bodies, and their peculiar relations to Jupiter, the massive planet next exterior,-all entitle this part of the system to more particular consideration thrill it has hitherto received. The folIowing essay is designed, therefore, to supply an obvious want. Its results are given in some detail up to the date of publication, presents in a popular form the leading historical facts as to the discovery of Ceres, PaIlzls, Juno, Vesta, and Astrza a tabular statement of the dates and places of discovery for the entire group a list of the narnea of discoverers, with the number of minor planets detected by each and a table of the principal elements so far as computed. In Part 11. this descriptive summary is followed by questions relating to the origin of the cluster the elimination of members from particular parts...

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