[484] Grant, History of Physical Astronomy, p. 370.
[485] Nature, July 25, 1889.
[486] Cosmos, vol. iv. p. 381.
[487] Cosmos, vol. iv. pp. 381-6.
[488] Ibid., vol. i. p. 121.
[489] The Observatory, vol. 6 (1883), pp. 327-8.
[490] Nature, June 25, 1874.
[491] Popular Astronomy, May, 1895, “Reflectors or Refractors.”
[492] Denning, Telescopic Work for Starlight Evenings, p. 225.
[493] Nature, November 2, 1893.