Catalogue Entry: OTHE00125

^[1] See Birch's Hist. Royal Society, vol. iii. pp. 63, 194, and Hooke's Posthumous works, pp. 186-190.

^[2] Physico-Mathesis de Lumine, Coloribus, et Iride, aliisque annexis. Bononiæ, 1665. 4to.

^[3] A concave lens is preferable to a convex one, for reasons which will presently be seen; and we recommend that it should be achromatic.

^[4] This result had been previously obtained by Sir Isaac Newton.

^[5] The hyperbolic form of the fringes had been previously discovered by Dr. Young. — Lect., vol. i. p. 287.

^[6] See the Phil. Trans., 1829, pp. 301-317.

^[7] These effects are so beautiful, that we have recommended the use of a diffracting apparatus for suggesting patterns for ribands. — See Reports of British Association, 1838, vol. vii. p. 12; Treatise on Optics, Edit. 1853, p. 117.

^[8] See Reports of British Association, vol. vii. p. 12, 1838.

^[9] Phil. Trans. 1796, p. 227; and 1797, p. 352.

^[10] Lord Brougham uses the term polarisation "merely because the effect of the first edge resembles polarisation, and without giving any opinion as to its identity."

^[11] Phil. Trans., 1850, pp. 235-260.