[586] Lick Report on Eclipse of December 22, 1889, p. 47; Month. Not., vol. l., p. 372.

[587] Lick Obs. Bull., No. 9.

[588] Bull. de l'Acad. St. Pétersbourg, t. iv., p. 289.

[589] The Solar Corona discussed by Spherical Harmonics, Smithsonian Institution, 1889.

[590] Bakerian Lecture, Proc. Roy. Soc., vol. xxxix.

[591] Astr. and Astrophysics, vol. xi., p. 483.

[592] Ibid., vol. xii., p. 804.

[593] Am. Journ. of Science, vol. xi., p. 253, 1901.

[594] See Huggins, Proc. Roy. Soc., vol. xxxix., p. 108; Young, North Am. Review, February, 1885, p. 179.

[595] Professor W. A. Norton, of Yale College, appears to have been the earliest formal advocate of the Expulsion Theory of the solar surroundings, in the second (1845) and later editions of his Treatise on Astronomy.