¹ Cohen, I. Bernard, The Newtonian Revolution (Cambridge University Press, 1980).Google Scholar

² Newtonian Revolution, p. 95Google Scholar. See also p. 15. Inexplicably, Mr. Cohen (p. 310, note 7) puts the onus on the editor of the Dictionary of the History of Ideas, rather than on the author of the piece that so offended him, the present impenitent writer.

³ Strong, E. W., ‘Newton's Mathematical Way’, Journal of the History of Ideas, 12, 1951, 90–110.CrossRefGoogle Scholar

⁴ The System was first published posthumously in 1728, in the same year as the Latin version. A second English edition appeared in 1731 and has been reproduced in facsimile (London, Dawson's of Pall Mall, 1969) with a valuable account of the history of the text in an introduction by Professor Cohen. See also Cohen, 's Introduction to Newton's Principia (Cambridge, Mass., 1971), p. 16, note 1.CrossRefGoogle Scholar

⁵ Newtonian Revolution, p. 95.Google Scholar

⁶ Opticks (1704), Book II, Part II, p. 44. Italics mine.Google Scholar

⁷ The Unpublished First Version of Isaac Newton's Cambridge Lectures on Optics 1670–1672 (Cambridge, The University Library, 1973)Google Scholar. This facsimile of MS. Add. 4002, has a short but useful introduction by D. T. Whiteside. My translation is from fol. 23.

⁸ MS. Add. 4002, fol. 23.

⁹ Principia (1687) p. 401Google Scholar (italics mine) and The Mathematical Principles of Natural Philosophy. By Sir Isaac Newton—Translated into English by Andrew Motte, 2 vols. (London, 1729), II, p. 201.Google Scholar

¹⁰ Newtonian Revolution, p. 95.Google Scholar

¹¹ Ibid.

¹² In Phillips, Edward, New World of Words, ed. Kersey, John (London, 1706)Google Scholar, where the definition reads:‘… the Word [Mathematicks] is now generally taken for certain noble Sciences, taught by true demonstration, and exercis'd about Quantity… These sciences are distinguished into Pure and Mixt, Speculative and Practical.’

¹³ The Correspondence of Isaac Newton, 7 vols. (Cambridge at the University Press, 1959–1977), I, 82–83.Google Scholar

¹⁴ Newton, Correspondence, I, 96Google Scholar. The word ‘naturalist’ simply meant ‘natural philosopher’ not commonly ‘experimental natural philosopher’ as Professor Cohen would have it. A contemporary dictionary defines a naturalist as ‘one who understands natural causes, or is skilled in Natural Philosophy.’ Phillips-Kersey (1706).

¹⁵ Newton, Correspondence, I, p. 113.Google Scholar

¹⁶ Newton, Correspondence, I, 187–188.Google Scholar

¹⁷ Opticks (1704), Book II, Part II, 47–48. Italics mine.Google Scholar

¹⁸ This distinction was essential to Newton's success in the physical investigation of colours; earlier in the Opticks (1704) he had stressed it in Book I, Part II, p. 120.Google Scholar