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

by Agnes M. Clerke

[883] Mémoires de l'Acad. de Bruxelles, t. xlix., No. 5, 4to; Astr. Nach., No. 2,809; f. Schorr, Der Venusmond, 1875.

[884] Phil. Trans., 1839, 1841, 1842.

[885] Delaunay objected (Comptes Rendus, t. lxvii., p. 65) that the viscosity of the contained liquid (of which Hopkins took no account) would, where the movements were so excessively slow as those of the earth's axis, almost certainly cause it to behave like a solid. Lord Kelvin, however (Report Brit. Ass., 1876, ii., p. 1), considered Hopkins's argument valid as regards the comparatively quick solar semi-annual and lunar fortnightly nutations.

[886] Phil. Trans., cliii., p. 573.

[887] Report Brit. Ass., 1868, p. 494.

[888] Ibid., 1882, p. 474.

[889] Albrecht, Astr. Nach., No. 3,131.

[890] Astr. Jour., Nos. 248, 249.

[891] Ibid., No. 258.

[892] Month. Not., vol. lii., p. 336.