1. Aristotle (ca. 340 B.C.). “Meteorologica,” Book I, Chapter 5. English translation by H. D. P. Lee, Harvard Univ. Press, Cambridge, Mass., 1952
2. “Traité Physique et Historique de l'Aurore Boréale.”;De Mairan,1733
3. Oration on aerial phenomena, proceeding from the force of electricity. Speech to the Academy on Nov. 25. See Menshutkin, B. N. (1952);Lomonosov,1753
4. Electrical experiments with an attempt to account for their several phenomena; together with some observations on thunderclouds;Canton;Phil. Trans. Roy. Soc.,1753
5. “Experiments and Observations on Electricity,”;Franklin,1774