time by the comings and goings of the cabin boy who brought

CHAPTER IX PHILOSOPHER-SCIENTISTS AND NEW INSTITUTIONS OF LEARNING [1] (p. 193). George L. Craik, Bacon and His Writings and Philosophy, 2 vols., London, 1846. Vol. II., p. 121. [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. 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. [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.]

by Henry Smith Williams, M.D., LL.D.

ASSISTED BY EDWARD H. WILLIAMS, M.D.

MODERN DEVELOPMENT OF THE PHYSICAL SCIENCES

CHAPTER I. THE SUCCESSORS OF NEWTON IN ASTRONOMY

The work of Johannes Hevelius--Halley and Hevelius--Halley's observation of the transit of Mercury, and his method of determining the parallax of the planets--Halley's observation of meteors--His inability to explain these bodies--The important work of James Bradley--Lacaille's measurement of the arc of the meridian--The determination of the question as to the exact shape of the earth--D'Alembert and his influence upon science- -Delambre's History of Astronomy--The astronomical work of Euler.

CHAPTER II. THE PROGRESS OF MODERN ASTRONOMY