Philosophical Transactions (1803), vol. xciii. p. 193.

Hofmann’s Introduction to Chemistry, p. 36.

Works, edited by Shaw, vol. i. pp. 141–145, quoted in Rees’s Encyclopædia, art. Cipher.

Nature, vol. i. p. 553.

Formal Logic, p. 172.

Philosophical Magazine, 4th Series, vol. i. p. 355.

Transactions of the Royal Society of Edinburgh, vol. xxi. part 4.

Philosophical Magazine, 4th Series, vol. vii. p. 465; vol. viii. p. 91.

Memoirs of the Manchester Literary and Philosophical Society, 3rd Series, vol. iv. p. 347.

Letters on the Theory of Probabilities, translated by Downes, 1849, pp. 36, 37.

Encyclopædia Metropolitana, art. Probabilities, p. 396.

Elements of Logic, Book III. sections 11 and 18.

Encyclopædia Metropolitana, art. Probabilities, p. 400.

Philosophical Transactions (1767). Abridg. vol. xii. p. 435.

Transactions of the Edinburgh Philosophical Society, vol. xxi. p. 375.