Lubbock, Essay on Probability, p. 14. De Morgan, Encyc. Metrop. art. Probability, p. 412. Todhunter’s History of the Theory of Probability, p. 543. Concerning the objections raised to these conclusions by Boole, see the Philosophical Magazine, 4th Series, vol. ii. p. 98. Boole’s Laws of Thought, pp. 364–375.

Laplace, Essai Philosophique, pp. 55, 56.

Chambers’ Astronomy, 2nd ed. pp. 346–49.

Traité élémentaire du Calcul des Probabilités, 3rd ed. (1833), p. 148.

Laws of Thought, pp. 368–375.

De Morgan’s Essay on Probabilities, Cabinet Cyclopædia, p. 67.

Essay on Probabilities, p. 128.

J. S. Mill, System of Logic, 5th edition, bk. iii. chap. xviii. § 3.