[184] Smyth’s Celestial Cycle, pp. 210, 211.

[185] Poor, The Solar System, p. 274.

[186] Celestial Cycle, p. 246.

[187] Nature, October 2, 1879.

[188] Ibid., May 6, 1880.

[189] Ibid., February 19, 1880.

[190] Nature, September 30, 1897.

[191] Nature, August 5, 1875.

[192] Ibid., October 12, 1882, and Copernicus, vol. iii. p. 85.

[193] Nature, May 8, 1884.