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

by Agnes M. Clerke

[445] Young, The Sun, p. 337, ed. 1897.

[446] H. Draper, Quart. Journ. of Sc., vol. i., p. 381; also Phil. Mag., vol. xvii., 1840, p. 222.

[447] Reproduced in Arago's Popular Astronomy, plate xii., vol. 1.

[448] Report Brit. Ass., 1859, p. 148.

[449] Phil. Trans., vol. clii., p. 407.

[450] Researches in Solar Physics, part i., p. 20.

[451] Both the phrase and the method were suggested by Faye, who estimated the average depth of the luminous sheath of spots at 2,160 miles. Comptes Rendus, t. lxi., p. 1082; t. xcvi., p. 356.

[452] Month. Not., vol. lv., p. 74.

[453] Sidgreaves, Ibid., p. 282; Cortie, Ibid., vol. lviii., p. 91.

[454] Explained by East as refraction-effects. Jour. Brit. Astr. Ass., vol. viii., p. 187.