(2) (p. 193). From Huxley's address On Descartes's Discourse Touching the Method of Using One's Reason Rightly and of Seeking Scientific Truth.

(3) (p. 195). Rene Descartes, Traite de l'Homme (Cousins's edition. in ii vols.), Paris, 1824. Vol, VI., p. 347.

CHAPTER X

THE SUCCESSORS OF GALILEO IN PHYSICAL SCIENCE

(1) (p. 205). See The Phlogiston Theory, Vol, IV.

(2) (p. 205). Robert Boyle, Philosophical Works, 3 vols., London, 1738.

Vol. III., p. 41.

(3) (p. 206). Ibid., Vol. III., p. 47.

(4) (p. 206). Ibid., Vol. II., p. 92.

(5) (p. 207). Ibid., Vol. II., p. 2.

(6) (p. 209). Ibid., Vol. I., p. 8.

(7) (p. 209). Ibid., vol. III., p. 508.

(8) (p. 210). Ibid., Vol. III., p. 361.

(9) (p. 213). Otto von Guericke, in the Philosophical Transactions of the Royal Society of London, No. 88, for 1672, p. 5103.

(10) (p. 222). Von Guericke, Phil. Trans. for 1669, Vol I., pp. 173, 174.

CHAPTER XI

NEWTON AND THE COMPOSITION OF LIGHT

(1) (p. 233). Phil. Trans. of Royal Soc. of London, No. 80, 1672, pp.

3076-3079. (2) (p 234). Ibid., pp. 3084, 3085.

(3) (p. 235). Voltaire, Letters Concerning the English Nation, London, 1811.

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.

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.

x.x.xVIII., 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.

(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.)