Poisson, Recherches sur la Probabilité des Jugements, Paris, 1837, pp. 82, 83.

Kirchhoff’s Researches on the Solar Spectrum. First part, translated by Roscoe, pp. 18, 19.

Edinburgh Review, No. 185, vol. xcii. July 1850, p. 32; Herschel’s Essays, p. 421; Transactions of the Cambridge Philosophical Society, vol. i. p. 43.

Evans’ Ancient Stone Implements of Great Britain. London, 1872 (Longmans).

Herschel, Outlines of Astronomy, 1849, p. 565; but Todhunter, in his History of the Theory of Probability, p. 335, states that the calculations do not agree with those published by Struve.

Philosophical Transactions, 1767, vol. lvii. p. 431.

Philosophical Magazine, 3rd Series, vol. xxxvii. p. 401, December 1850; also August 1849.

History, &c., p. 334.

Essai Philosophique, p. 57.

Proceedings of the Royal Society; 20 January, 1870; Philosophical Magazine, 4th Series, vol. xxxix. p. 381.

Principia, bk. ii. General scholium.

Essai Philosophique, p. 55. Laplace appears to count the rings of Saturn as giving two independent movements.