A Popular History of Astronomy During the Nineteenth Century / Fourth Edition

by Agnes M. Clerke

[250] Mém. de St. Pétersbourg, t. xxxii., No. 3, 1884; Astr. Nach., No. 2,727.

[251] Month. Not., vol. xix., p. 72.

[252] Mécanique Céleste, t. ii., p. 197.

[253] See Berberich, Astr. Nach., Nos. 2,836-7, 3,125; Deichmüller, Ibid., No. 3,123.

[254] Month. Not., vol. ii., p. 117.

[255] Astr. Nach., No. 128.

[256] Annuaire, 1832, p. 186.

[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.

[258] Month. Not., vol. vii., p. 73.

[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.