[98] Rees’s Cyclopædia, art. Cipher.

[99] Œuvres Complètes de Pascal (1865), vol. iii. p. 302. Montucla states the name as De Gruières, Histoire des Mathématiques, vol. iii. p. 389.

[100] Histoire des Mathématiques, vol. iii. p. 378.

[101] Bernoulli, De Arte Conjectandi, translated by Francis Maseres. London, 1795, p. 75.

[102] Wallis’s Algebra, Discourse of Combinations, &c., p. 109.

[103] Œuvres Complètes, vol. iii. p. 251.

[104] See also Galton’s Lecture at the Royal Institution, 27th February, 1874; Catalogue of the Special Loan Collection of Scientific Instruments, South Kensington, Nos. 48, 49; and Galton, Philosophical Magazine, January 1875.

[105] Wallis, Of Combinations, p. 116, quoting Vossius.

[106] Philosophical Transactions (1803), vol. xciii. p. 193.

[107] Hofmann’s Introduction to Chemistry, p. 36.