
Paper communicated to Frederic Farrar (1854) Æt. 23, as quoted in Lewis Campbell, William Garnett, The Life of James Clerk Maxwell: With Selections from His Correspondence and Occasional Writings (1884) pp. 144-145, https://books.google.com/books?id=B7gEAAAAYAAJ&pg=PA144 and in Richard Glazebrook, James Clerk Maxwell and Modern Physics (1896) pp. 39-40. https://books.google.com/books?id=hbcEAAAAYAAJ&pg=PA39