Joseph Priestley (1790). “Experiments and Observations on Different Kinds of Air and Other Branches of Natural Philosophy, Connected with the Subject ...: Being the Former Six Volumes Abridged and Methodized, with Many Additions”, p.43
William Stanley Jevons's reflections on his earlier life, written when he was 27 (December 1862); later published in "Letters and Journal of W. Stanley Jevons" edited by Harriet A. Jevons, his wife (p. 12), 1886.