[44]A. von Braunmühl, Geschichte der Trigonometrie, 2. Teil, Leipzig, 1903, pp. 42, 91. [45]H. Hankel, Geschichte der Mathematik in Alterthum und Mittelalter, Leipzig, 1874, pp. 369, 370. [46]M. Cantor, Vorlesungen über Geschichte der Mathematik, II, 1900, pp. 640, 641. [47]This matter has been discussed in a paper by F. Cajori, “A History of the Arithmetical Methods of Approximation, etc., Colorado College Publication, General Series No. 51, 1910, pp. 182-84. Later this subject was again treated by G. Eneström in Bibliotheca mathematica, 3. Folge, Vol. XI, 1911, pp. 234, 235. [48]See F. Cajori, op. cit., p. 193. [49]See William Oughtred’s Key of the Mathematicks, London, 1694, pp. 173-75, tract, “Of the Resolution of the Affected Equations,” or any edition of the Clavis after the first. [50]A. De Morgan, op. cit., p. 451; 2d ed., Vol. II, p. 303. [51]See F. Cajori, History of the Logarithmic Slide Rule, New York, 1909, pp. 7-14, Addenda, p. ii. [52]Rigaud, op. cit., Vol. I, p. 12. [53]The New Artificial Gauging Line or Rod: together with rules concerning the use thereof: Invented and written by William Oughtred, London, 1633. [54]W. Oughtred, Apologeticall Epistle, p. 13. [55]Quarterly Journal of Pure and Applied Mathematics, Vol. XLVI, (1915), p. 169. In this article Glaisher republishes the “Appendix” in full. [56]Aubrey, op. cit., Vol. II, 1898, p. 108. [57]Wood’s Athenae Oxonienses (ed. P. Bliss), Vol. IV, 1820, p. 247. [58]Wood, op. cit., Vol. II, p. 445. [59]Rigaud, op. cit., Vol. I, pp. 33, 35. [60]Rigaud, op. cit., Vol. I, pp. 16, 26. [61]Rigaud, op. cit., Vol. I, p. 66. [62]Ibid., Vol. I, p. 9. [63]Rigaud, op. cit., Vol. II, p. 475. [64]Ibid., Vol. II, p. 471. [65]J. W. L. Glaisher, “On Early Logarithmic Tables, and Their Calculators,” Philosophical Magazine, 4th Ser., Vol. XLV (1873), pp. 378, 379. [66]Rigaud, op. cit., Vol. I, p. 65. [67]Rigaud, op. cit., Vol. I, p. 87. [68]King’s Life of John Locke, Vol. I, London, 1830, p. 227. [69]Exercitationum Mathematicarum Decas prima, Naples, 1627, and probably Cataldus’ Transformatio Geometrica, Bonon., 1612. [70]Rigaud, op. cit., Vol. II, pp. 477-80. [71]Miscellanies: or Mathematical Lucubrations, of Mr. Samuel Foster, Sometimes publike Professor of Astronomie in Gresham Colledge in London, by John Twysden, London, 1659. [72]The Works of the Honourable Robert Boyle in five volumes, to which is prefixed the Life of the Author, Vol. I, London, 1744, p. 24. [73]The letter is printed in John Wallis’ De algebra tractatus, 1693, p. 206. [74]See La Correspondance de Descartes, published by Charles Adam and Paul Tannery, Vol. II, Paris, 1898, pp. 456 and 457. [75]H. Bosmans, S.J., “La première édition de la Clavis Mathematica d’Oughtred. Son influence sur la Géométrie de Descartes,” Annales de la société scientifique de Bruxelles, 35th year, 1910-11, Part II, pp. 24-78. [76]Ibid., p. 78.