[139]Gravelaar, "Over den oorsprong van ons maalteeken (x)," Wiskundig Tijdschrift, 6th year. We have not had access to this article.

[141]Claudii Ptolemaei . . . . annotationes, Bâle, 1551. This reference is taken from the Encyclopédie des sciences mathématiques, Tome I, Vol. I, Fasc. 1, p. 40.

William Oughtred — Part 62

[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.

William Oughtred — Part 62

[143]Oughtred, Apologeticall Epistle, p. 27.

William Oughtred — Part 62

[144]J. Edleston, Correspondence of Sir Isaac Newton and Professor Cotes, London, 1850, pp. 279-92.

Adam, Charles, 71 Agnesi, Maria G., 77 Alexander, J., 76 Allen, E., 35 Analysis, 19, 20 Apollonius of Perga, 20, 85 Archimedes, 18, 20, 85 Aristotle, 69 Ashmole, E., 13 Atkinson, J., 79 Atwood, 56 Aubrey, 3, 7, 8, 12-16, 58, 59 Austin, 58

Baker, T., 82 Balam, R., 79 Bar-le-Duc, de, 80 Barrow, S., 1, 32, 73, 74, 80, 81 Bartaloni, D., 79 Beman, W. W., 74, 75 Bernoulli, Jakob, 78-80 Bernoulli, John, 79, 80 Billingsley's Euclid, 15 Billion, 20 Billy, Jacobo de, 80 Binomial formula, 25, 29 Bliss, P., 60 Boscovich, R. G., 78 Bosmans, H., 72, 83 Boyle, R., 1, 69 Braunmühl, von, 39 Brearly, W., 59 Briggs, 6, 36, 55 Brookes, Christopher, 7, 53, 59

Cajori, F., 27, 39, 40, 47 Cantor, M., 40, 41 Caraccioli, J. B., 78 Cardan, 71 Carré, 77 Carrete, N. M., 78 Caryll, C., 7 Cataldi, 67 Cavalieri, 65, 66 Cavendish, Charles, 17, 62, 66 Charles I, 9, 60 Chelvicius, P., 79 Cheyne, G., 82 _Circles of Proportion_, 35, 37, 48, 49, 51, 59, 87, 88 Clairaut, 77 Clark, A., 3 Clark, G., 63 Clarke, F. L., 3 _Clavis mathematicae_, 1, 5, 10, 14, 17-35, 45, 46, 51, 57-63, 68-73, 81, 85, 87 Clavius, 26, 80 Clerc, le, 77 Cobb, S., 76 Cocker, 76, 82 Collins, John, 15, 19, 63, 64, 67, 68, 76, 82 Colson, J., 77 Conchoid, 12 Conic sections, 11, 53 Cossali, P., 81 Cotes, R., 1, 85 Craig, J., 76, 82 Cross, symbol of multiplication, 27, 38, 55, 56, 82, 83 Cubic equations, 28, 34, 42, 45

Decimal fractions, notation of, 21 Degree, centesimal division, 39 Delamain, R., 4, 9, 10, 11, 47, 48, 51, 60, 84, 88, 89, 91, 93, 94 De Moivre, 32, 79 De Morgan, A., 5, 16, 37, 46, 47, 54 Descartes, R., 1, 25, 47, 57, 68-72, 80 Dibuadius, 79 Difference, symbol for, 27, 81 Diophantus, 63, 85 Division, abbreviated, 21, 23, 24 Dulaurens, F., 74, 82