Notes
1Alan J. Rocke, The Quiet Revolution: Hermann Kolbe and the Science of Organic Chemistry (Berkeley, CA, 1993).
2Robert K. DeKosky, ‘Spectroscopy and the Elements in the Late Nineteenth Century: The Work of Sir William Cookes’, British Journal for the History of Science, 6 (1973), 400–423.
3Robert K. DeKosky, ‘William Crookes and the Fourth State of Matter’, Isis, 67 (1976), 36–60.