[Footnote 245: Arago, _Annuaire_ (1832), p. 218.] [Footnote 246: Hind, _The Comets_, p. 20.] [Footnote 247: _Phil. Trans._, vol. xlvi., p. 204.] [Footnote 248: _Astr. Nach._, No. 2,134.] [Footnote 249: _Comptes Rendus_, t. cvii., p. 588.] [Footnote 250: _Mém. de St. Pétersbourg_, t. xxxii., No. 3, 1884; _Astr. Nach._, No. 2,727.] [Footnote 251: _Month. Not._, vol. xix., p. 72.] [Footnote 252: _Mécanique Céleste_, t. ii., p. 197.] [Footnote 253: See Berberich, _Astr. Nach._, Nos. 2,836-7, 3,125; Deichmüller, _Ibid._, No. 3,123.] [Footnote 254: _Month. Not._, vol. ii., p. 117.] [Footnote 255: _Astr. Nach._, No. 128.] [Footnote 256: _Annuaire_, 1832, p. 186.] [Footnote 257: _Am. Journ. of Science_, vol. i. (2nd series), p. 293. Prof. Hubbard's calculations indicated a probability that the definitive separation of the two nuclei occurred as early as September 30, 1884. _Astronomical Journal_ (Gould's), vol. iv., p. 5. See also, on the subject of this comet, W. T. Lynn, _Intellectual Observer_, vol. xi., p. 208; E. Ledger, _Observatory_, August, 1883, p. 244; and H. A. Newton, _Am. Journ. of Science_, vol. xxxi., p. 81, February, 1886.] [Footnote 258: _Month. Not._, vol. vii., p. 73.] [Footnote 259: _Bulletin Ac. Imp. de St. Pétersbourg_, t. vi., col. 77. The latest observation of the parent nucleus was that of Argelander, April 27, at Bonn.] [Footnote 260: D'Arrest, _Astr. Nach._, No. 1,624.] [Footnote 261: _Der Brorsen'sche Comet._ Von Dr. E. Lamp, Kiel, 1892; Plummer, _Knowledge_, vol. xix., p. 41.] [Footnote 262: Schulhof, _Astr. Nach._, No. 3,267; _Observatory_, vol. xviii., p. 64; F. H. Seares, _Astr. Nach._, Nos. 3,606-7; Plummer, _Knowledge_, vol. xix., p. 156.] [Footnote 263: _Comptes Rendus_, t. xxv., p. 570.] [Footnote 264: _Month. Not._, vol. xii., p. 248.] [Footnote 265: _Bull. Astr._, t. vi., pp. 241, 289.] [Footnote 266: _Étude sur la Théorie des Comètes périodiques. Annales de l'Observatoíre_, t. xx., Paris, 1891.] [Footnote 267: _Amer. Journ. of Science_, vol. xlii., pp. 183, 482, 1891.] [Footnote 268: _Observatory_, vol. xiv., p. 194.] [Footnote 269: _Phil. Trans._, vol. cii., pp. 118-124.] [Footnote 270: _Ueber den Schweif des grossen Cometen von 1811, Monat. Corr._, vol. xxv., pp. 3-22. Reprinted by Zöllner. _Ueber die Natur der Cometen_, pp. 3-15.] [Footnote 271: _Natur der Cometen_, p. 148.] [Footnote 272: The subject of a classical memoir by Bessel, published in 1810.] [Footnote 273: A fresh investigation of its orbit has been published by N. Herz of Vienna. See _Bull. Astr._, t. ix., p. 427.] [Footnote 274: _Astr. Jahrbuch_ (Bode's), 1823, p. 134.] [Footnote 275: Reproduced in Webb's _Celestial Objects_, 4th ed.] [Footnote 276: _Month. Not._, vol. xxxvi., p. 309.] [Footnote 277: _Celestial Objects_, p. 40, note.] [Footnote 278: See Airy's Address, _Mem. R. A. S._, vol. x., p. 376. Rosenberger calculated no more, though he lived until 1890. W. T. Lynn, _Observatory_, vol. xiii., p. 125.]