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SEVERAL alterations and additions are made in this Edition, besides what have been introduced into the Third, to bring it up to the actual state of astronomical discovery. The elements of four new planets (Parthenope, Egeria, Victoria, and Irene) have been added, and improved elements of Iris, Metis, Hebe, and Hygeia, substituted for the provisional elements before given. The remarkable discovery of an additional ring of Saturn, and the curious researches of M. Peters on the proper motion of Sirius, with several minor features, are noticed. Where such additions are introduced in the text, they are indicated by being enclosed in brackets [ ].

J. F. W. HERSCHIEL.

London, Aug. 6. 1851.

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