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CHAPTER XII

NEWTON AND THE LAW OF GRAVITATION

(1) (p. 242). Sir Isaac Newton, Principia, translated by Andrew Motte, New York, 1848, pp. 391, 392.

(2) (p. 250). Newton op. cit., pp. 506, 507.

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CHAPTER XIV

PROGRESS IN ELECTRICITY FROM GILBERT AND VON GUERICKE TO FRANKLIN

(1) (p. 274). A letter from M. Dufay, F.R.S. and of the Royal Academy of Sciences at Paris, etc., in the Phil. Trans. of the Royal Soc., vol. XXXVIII., pp. 258-265.

(2) (p. 282). Dean von Kleist, in the Danzick Memoirs, Vol. I., p. 407. From Joseph Priestley's History of Electricity, London, 1775, pp. 83, 84.