[74] Exposition du Système du Monde, quoted by Carl Snyder in The World Machine, p. 226.
[75] Worlds in the Making, p. 63.
[76] Cosmos, vol. i. p. 131.
[77] The Observatory, June, 1909, p. 261.
[78] Astronomical Essays, pp. 61, 62.
[79] Encyclopædia Britannica (Schiraz).
[80] Monthly Notices, R.A.S., February, 1905.
[81] Nature, March 3, 1870.
[82] Ibid., March 31, 1870, p. 557.
[83] Prof. W. H. Pickering found 12 times (see p. 1).