INDEX. 235 



Pago. 



Interference, by singlo mirror ITO 



by very obtuse angled prism 170 



Interferences iu liquid waves 162 



in waves of sound ,^^? 



in waves of light 163-64 



measurements of ditto ^Jp 



trajectories iu 1'''4, l^S 



of polarized Ught 1G5, 2U4-15 



Isochronism of vibrations 147 



Jamiu, his researches on change of phase in reflection 198 



his "compensator' 199 



liSevogyration and dextrogyration, terms defined 135 



Lamina, Airy's " quarter-wavo" 139, 206 



Lamina;, thin, colors in 118-20 



crystalline, colors in polarized light 132, 204-10 



Law of Brewster for polarizing angle 128 



of Mains for intensity of rays in double refraction 129 



of SneUius for ordinary refraction 109 



Laws of vibration 146-51 



governing direction of molecular movement.iu double refraction 218-20, 227 



Lemuiscate curves seen iu two-axed crystals 139 



equation of 214 



Lengths, absolute, of undulations 170 



table of 171 



relative, of undulations of different colors 171 



Light, early notions of 108 



theories of 143 



theory of emission of 143-46 



of undulation 143, 147 



compound nature of Ill 



dispersion of lUi 1^^ 



velocity of - 121, 125 



polarization of, by reflection 127 



by refraction 130 



by double refraction 118 



circular and elliptic of \^''^~''^^ 



rotatory of 135, 200 



atmospheric of 143 



depolarization of 165 



interferences of ^Ip5 



conical and cylindric refraction of 226-30 



of the sun and incandescent gases, not pola^-ized 131 



of incandescent liquids and solids partially polarized 131 



polarized, chromatics of 204 



Limits of thickness within which colors appear in crystalline plates 133 



Lines of equal ray velocity in two-axed crystals 226 



fixed, in the spectrum 125-27 



in the spectra of incandescent bodies 3 27 



Liquids, rotatory power observed iu 141 



Liquid waves, interferences in 162-63 



Loci of diffraction interferences 170, 174 



Magnetism rotates the plane of polarization 204 



Mains, polarization by reflection discovered by 127 



his law for intensities of rays in double refraction 129 



Material theory of light 143-46 



Measure of time, in vibration 149 



Measurements of the velocity of light 121-25 



of diffraction fringes 174 



of interference fringes 170 



of thicknesses of plates producing Newton's rings 119 



of undulation lengths -- 171 



' Metals, reflection from, produces clliijtic polarization -' 138 



Minute apertures produce diffraction 114, 177 



Minute opaque bodies prodvice diffraction 175 



Mirror experiment, Fresnel's, producing interference 168-69 



Mirror, experiment with single, producing interference 170 



Mirrors, polarizing 132 



Molecular movements, varieties of 157 



in sound 162 



in luminous waves 162 



in plane polarizatiou 215 



in cinnUarpolarization 197 



in ellijitic polarization 198 



in doubh.' refraction 162, 218-20 



relation of, to plane of polarization 216-17 



Monge, curious experiment by, iu double refraction 116 



Motion, progressive, of light • 121-23 



Movements, molecular, in undulation '. 151-53, 164 



of plane of polarizatiou in chromatic experiments 206 



relation of, to plane of polarizatiou ~^''~I^ 



Narrow apertures, diffraction prodiiced by 177 



opaque bodies, diffraction prfiduced bj' -^ ] 75 



Negative and positive crystals, in double refraction 116, 222, 230 



Neutral points in the atmosphere 143 



Newton, compound nature of light announced by m 



his researches on colors of thin plates 1 18-20 



of thick plates 120 



