133
J. Milnes, Sectionum conicarum elementa, Oxford, 1702, p. 42.
134
Cheyne, Philosophical Principles of Natural Religion, London, 1705, p. 55.
135
J. Craig, De calculo fluentium, London, 1718, p. 86.
136
Jo. Wilson, Trigonometry, 2d ed., Edinburgh, 1724, p. v.
137
Commercium Epistolicum, 1712, p. 20.
138
C. Le Paige, “Sur l’origine de certains signes d’opération,” Annales de la société scientifique de Bruxelles, 16th year, 1891-92, Part II, pp. 79-82.
139
Gravelaar, “Over den oorsprong van ons maalteeken (×),” Wiskundig Tijdschrift, 6th year. We have not had access to this article.
140
H. Bosmans, op. cit., p. 40.
141
Claudii Ptolemaei.. annotationes, Bâle, 1551. This reference is taken from the Encyclopédie des sciences mathématiques, Tome I, Vol. I, Fasc. 1, p. 40.
142
Due Correction for Mr. Hobbes. Or Schoole Discipline, for not saying his Lessons right. In answer to his Six Lessons, directed to the Professors of Mathematicks. By the Professor of Geometry. Oxford, 1656, pp. 7, 47, 50.
143
Oughtred, Apologeticall Epistle, p. 27.
144
J. Edleston, Correspondence of Sir Isaac Newton and Professor Cotes, London, 1850, pp. 279-92.