William Oughtred

116

Chr. Clavii Operum mathematicorum tomus secundus, Mayence, 1611, Algebra, p. 39.

117

Invention nouvelle en l’algèbre, by Albert Girard, Amsterdam, 1629, p. 17.

118

La géométrie et pratique générale d’icelle, par I. Errard de Bar-le-Duc, Ingénieur ordinaire de sa Majesté, 3d ed., revised by D. H. P. E. M., Paris, 1619, p. 216.

119

Novae geometriae clavis algebra, authore P. Jacobo de Billy, Paris, 1643, p. 157; also an Abridgement of the Precepts of Algebra. Written in French by James de Billy, London, 1659, p. 346.

120

Miscellanies: or Mathematical Lucubrations, of Mr. Samuel Foster, Sometime publike Professor of Astronomie in Gresham Colledge in London, London, 1659, p. 7.

121

Quarterly Jour. of Pure and Applied Math., Vol. XLVI (London, 1915), p. 191.

122

Pietro Cossali, Origine, trasporto in Italia primi progressi in essa dell’ algebra, Vol. I, Parmense, 1797, p. 52.

123

In Is. Bullialdi astronomiae philolaicae fundamenta inquisitio brevis, Auctore Setho Wardo, Oxford, 1653, p. 1.

124

John Wallis, Algebra, London, 1685, p. 321, and in some of his other works. He makes greater use of Harriot’s symbols.

125

Euclidis data, 1657, p. 1; also Euclidis elementorum libris XV, London, 1659, p. 1.

126

John Kersey, Algebra, London, 1673, p. 321.

127

E. Wells, Elementa arithmeticae numerosae et speciosae, Oxford, 1698, p. 142.

128

Cocker’s Decimal Arithmetick, perused by John Hawkins, London, 1695 (preface dated 1684), p. 278.

129

Th. Baker, The Geometrical Key, London, 1684, p. 15.

130

Richard Sault, A New Treatise of Algebra, London (no date).

131

Richard Rawlinson in a pamphlet without date, issued sometime between 1655 and 1668, containing trigonometric formulas. There is a copy in the British Museum.

132

F. Dulaurens, Specima mathematica, Paris, 1667, p. 1.

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.