INDEX TO LECTURES ON THE UNDULATORY THEORY. 



Page. 



Aberration, stfllar, velocity of light ascertained by means of 122 



Absolute lougths of umlulatious, bow measured ; table of 170, 171 



Agate, p(.-culiar property of 132 



Airys spirals 136 



his ■ 'quarter-wave lamina" 139, 206 



Amount of light reflected at any iucideuce 194 



polarized at do. 195 



Analyzer defined 133 



Angle of incidence 108 



of refraction 108 



of reflection 108 



limiting, in total reflection 138 



polarizing. Brewster's law of 128 



between (ijitie axes and normals to cu-cular sections of Burfaco of elasticity 228 



Apertures, minute, iirdduce difl'raction 114 



annular, experiments with, inilitto 179 



Apparatus, polarizing 130-32 



Arago, his discovery of colors in.polarized ligh^ 132 



of atmospheric polarization 143 



his experimental comparison of the velocities of light in air and water 124 



interesting experiment by, in interference 171 



his interference prism 170 



Atmospheric polarization 143 



neutral points of 143 



Axes, optic, of crystals 1 15, 139, 216, 227 



Azimuth 117 



indeterminate in vibrations of common light 1(J5 



of plane of polarization changed by reflection 195 



Azimuths, relative, of vibrations in double refraction 162, 220 



Bartholinus, Erasmus, treatise by, on double refraction 114 



Biot. his discovery of rotatory polarization in liquids 141 



Bodies, opaque, produce diti'ractiou fringes in divergent pencils 114, 175, 179 



minute, bright fringes in the shadows of 175 



elastic, impact of 158 



Body vibrating, undulations produced by, in elastic fluid 151 



laws of its movements 146-51 



Boundaries of shadows, why sharp 180 



of reflected and refracted beams 180 



Bradley, aberration of the stars discovered by 122 



Breadth of diffraction fringes, measurements of 170, 174 



Brewster, his law for polarizing angle 128 



discovery of two axes in crystals 139 



of tixed linei^ in the spectrum^. 126 



of rings in quartz 135 



of polarization by heat, pressui'e, torsion, &c 140 



investigations of elliptic polarization 138 



experiment on colors of thick plates 120 



interesting experiment on reflection of polarized light 128 



Brushes, dark, seen in the rings of crystals 135-40, 214-15, 222-24 



Bmidles of glass plates used as polarizers 1.30 



their transparency 131 



Case of failure of Fresnel's formulae for reflection 138. 196 



Cauchy, his investigations of dispersion 155-6 



Causes of varying elasticity of the ether in crystals 230 



Change of phase of undulation produced by reflection 196, 199 



of plane of polarization by do 195 



of azimuth in vibrations of common light 165 



Chromatic exiierinients, movements of the planes of polarization in 206 



Chromaiics of jiolarized light 204-15 



Circular aperture, diffraction by 178-80 



sections of surface of elasticity 221 



normals to ditto 222 



polarization produced by Fresnel's rhomb 1 37 



by Airy 's ' 'quarter-wave lamina" 139, 206 



Circularly polarized light, rings seen in, distorted 139, 211 



Clock, polar, of Wheatstone 143 



Cold and heat, polarization produced by 140 



Color aud rcfraugibility, mutual relation between Ill 



Colors of thin plates 118-20,183-87 



of thick do 120,167 



of crystalline laraime in polarized light 132-34, '20.5-10 



of crystals cut across the axis 134-37, 210-15, 222-24 



of quartz do. 135, 211-1'J 



of the spectrum IH 



of ruled surfaces 183 



thicknesses which produce, in crystalline plates 133 



in liewion's rings US) 



