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

by Agnes M. Clerke

[290] Herschel, Outlines of Astronomy, p. 399, 9th ed.

[291] Outlines, p. 398.

[292] Boguslawski calculated that it extended on the 21st of March to 581 millions.—Report. Brit. Ass., 1845, p. 89.

[293] Comptes Rendus, t. xvi., p. 919.

[294] Observatory, vol. xxiv., p. 167; Astr. Nach., No. 3,320.

[295] Piazzi noticed a considerable increase of lustre in a very faint star of the twelfth magnitude viewed through a comet. Mädler, Reden, etc., p. 248, note.

[296] Astr. Jahrbuch, 1828, p. 151.

[297] Mädler, Gesch. d. Astr., Bd. ii., p. 412.

[298] Recueil de l'Ac. Imp. de St. Pétersbourg, 1835, p. 143.

[299] Guillemin's World of Comets, trans, by J. Glaisher, p. 294, note.