System of the World, translated by Harte, vol. ii. p. 335.

This curious phenomenon, which I propose to call pedesis, or the pedetic movement, from πηδόω, to jump, is carefully described in my paper published in the Quarterly Journal of Science for April, 1878, vol. viii. (N.S.) p. 167. See also Proceedings of the Literary and Philosophical Society of Manchester, 25th January, 1870, vol. ix. p. 78, Nature, 22nd August, 1878, vol. xviii. p. 440, or the Quarterly Journal of Science, vol. viii. (N.S.) p. 514.

Maxwell, Theory of Heat, p. 301.

Laplace, Essai Philosophique, p. 59. Todhunter’s History, pp. 491–494.

Chambers’ Astronomy, 1st ed. p. 203.

Essay on Probabilities, Cabinet Cyclopædia, p. 121.

Philosophical Magazine, 4th Series (1867), vol. xxxiv. p. 64.

See Notes to Measures of Double Stars, 1204, 1336, 1477, 1686, 1786, 1816, 1835, 1929, 2081, 2186, pp. 265, &c. See also Herschel’s Familiar Lectures on Scientific Subjects, p. 147, and Outlines of Astronomy, 7th ed. p. 285.

Jevons, On the Cirrous Form of Cloud, Philosophical Magazine, July, 1857, 4th Series, vol. xiv. p. 22.

Astronomy, 4th ed. p. 358.

Babbage, Ninth Bridgewater Treatise, p. 67.

Cuvier, Essay on the Theory of the Earth, translation, p. 61, &c.

Murchison’s Siluria, 1st ed. p. 432.