Baily, British Association Catalogue, p. 48.

Outlines of Astronomy, § 850, 4th edit. p. 578.

Life of Faraday, vol. ii. p. 87.

Proceedings of the Royal Society, vol. xvii. p. 212. Chemical and Physical Researches, reprint, by Young and Angus Smith, p. 290.

Essai sur la Nomenclature et la Classification, Paris, 1823, pp. 107, 108.

George Bentham, Outline of a New System of Logic, p. 115.

Outline of a New System of Logic, 1827, p. 117.

Porphyrii Isagoge, Caput ii. 24.

Jevons, Elementary Lessons in Logic, p. 104.

Chrestomathia; being a Collection of Papers, &c. London, 1816, Appendix V.

The Classification of the Sciences, &c., 3rd edit. p. 7. Essays: Scientific, Political, and Speculative, vol. iii. p. 13.

Owen, Essay on the Classification and Geographical Distribution of the Mammalia, p. 20.

Dana’s Mineralogy, vol. i. p. 123; quoted in Watts’ Dictionary of Chemistry, vol. ii. p. 166.

Instructions for the Discrimination of Minerals by Simple Chemical Experiments, by Franz von Kobell, translated from the German by R. C. Campbell. Glasgow, 1841.

Edition of 1866, p. lxiii.

Philosophia Botanica (1770), § 154, p. 98.