[208] Pelicotetics, or the Science of Quantity; an Elementary Treatise on Algebra, and its groundwork Arithmetic. By Archibald Sandeman, M. A. Cambridge (Deighton, Bell, and Co.), 1868, p. 304.
[209] De Morgan’s Trigonometry and Double Algebra, p. 5.
[210] English Works of Thos. Hobbes, Edit. by Molesworth, vol. i. p. 95.
[211] Confessions, bk. xi. chapters 20–28.
[212] Sir G. C. Lewis gives many curious particulars concerning the measurement of time in his Astronomy of the Ancients, pp. 241, &c.
[213] Principia, bk. i. Scholium to Definitions. Translated by Motte, vol. i. p. 9. See also p. 11.
[214] Rankine, Philosophical Magazine, Feb. 1867, vol. xxxiii. p. 91.
[215] Treatise on Natural Philosophy, vol. i. p. 179.
[216] Proceedings of the Manchester Philosophical Society, 28th Nov. 1871, vol. xi. p. 33.
[217] The Elements of Natural Philosophy, part i. p. 119.