(3) (p. 288). Benjamin Franklin, New Experiments and Observations on Electricity, London, 1760, pp. 107, 108.
(4) (p. 291). Franklin, op. cit., pp. 62, 63.
(5) (p. 295). Franklin, op. cit., pp. 107, 108.
(For notes and bibliography to vol. II. see vol. V.)