Max Müller, Lectures on the Science of Language, Second Series, vol. ii. p. 63; or Sixth Edition, vol. ii. p. 67. The view of the etymological meaning of “intellect” is given above on the authority of Professor Max Müller. It seems to be opposed to the ordinary opinion, according to which the Latin intelligere means to choose between, to see a difference between, to discriminate, instead of to unite.

Hartley on Man, vol. i. p. 359.

Principles of Psychology, Second Ed., vol. ii. p. 86.

Pure Logic, or the Logic of Quality apart from Quantity, 1864, pp. 10, 16, 22, 29, 36, &c.

Brewster, Treatise on New Philosophical Instruments, p. 273. Concerning this method see also Whewell, Philosophy of the Inductive Sciences, vol. ii. p. 355; Tomlinson, Philosophical Magazine, Fourth Series, vol. xl. p. 328; Tyndall, in Youmans’ Modern Culture, p. 16.

Formal Logic, p. 38.

Hallam’s Literature of Europe, First Ed., vol. ii. p. 444.

Outline of a New System of Logic, London, 1827, pp. 133, &c.

An Investigation of the Laws of Thought, pp. 27, &c.

Formal Logic, pp. 82, 106. In his later work, The Syllabus of a New System of Logic, he discontinued the use of the sign.

Principles of Psychology, Second Ed., vol. ii. pp. 54, 55.

Pure Logic, or the Logic of Quality, p. 14.

Pure Logic, pp. 18, 19.