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INDEX 445 IKI Iridescent glass, 331 Iris diaphragm, use of, 202, 210,212 Ives, Mr., and the ether light, 95 JETS, improving, 60; oxy-spirit, 46 ; oxy-gas or safety, 47; mixed, 51, 59; best form of, 62, 63; attachment and fixing, 66 Jewsbury, Mr. S., on fluorescence, 319 KALEIDOPHOXE, 252, 266 Kaleidoscope, lantern, 145 Kaleidotrope, the, 144, 338 Kerr, Dr., on magnetic rotation, 376 ; electrostatic stress, 398 Kingsley, Eev. W., and projecting microscopes, 180 Konig's manometric flames, 269 Kiihne's surface-tension experi- ment, 407 Kundt's dust-figures, 273 Kymographion, Ludwig's, 239 LAMPS, oil, 34, 417 ; petroleum, 36, 417 ; gas, 40, 418 ; spirit burner, 418 ; acetylene gas, 419 ; electric, 40, 163; for lecturers, 132, 178 Lantern, choice of a, 111 ;.stereo- scope, 438 Lantern, parts of a, 13 Lantern-box, the, 134 Lantern-microscope, the, 179 Lantern-slides, see Slides Lanterns, single, 101; bi-unial, 109; tri-unial, 118 ; demonstrating and scientific, 153, 432 Leakage in gas-bags, 42 Lecturer's lamp, 132, 178 Lengthening tubes, 33 Lens, action of a, 5 Lenses for projecting physical apparatus, 175 ; ornni focal, 433 Lever slides, 142 Lieberkiihn, 201 Light (lamp) for a lecturer, 132,178 Light, experiments in, 294-385; rays of, 1; reflection, 274, re- MEM fraction, 278; dispersion, 282; composition of, 285; spectrum, 304 ; fluorescence, 317; inter- ference, 321; polarisation, 349 ; identity with heat, 392 Light (radiant), adjusting the, 115 ; for kaleidoscope, 146 ; for microscope, 197 Lightning, slide for, 141 Lime-light, the, 42 Limes, 47, 50, 68 ; substitutes for, 68 Lime-shield, Wood's, 66 Lime-tongs, 71 Lime-turning movements, 60, 64 Line spectra, 306; reversed, 310 Lippmann's capillary electro- meter, 240, 408 Liquids, expansion in, 386 Lissajous' figures, 255, 258, 352 Living objects for microscope, 204 Lodge, Dr. 0., oscillating character of static discharge, 400 Lubricating taps, 109 Luminous cascade, 280; paint, 320 Lycopodium for halos, 335 MACH'S acoustic experiments, 273 ; revolving polariscope, 371 Magnetic curves, 395 Magnetism, 394 Management of lime-light, 71; of an exhibition, 113 Manipulation of lanterns, 101 Mann, Dr. J. D., and reed project- ing apparatus, 262 Manometric flames, 269 Marey's recording apparatus, 234 Marking slides, 117 Marriotte's law, 229 Masks for mounting slides, 415 Mason, Mr., and screens, 126 Mayer, Prof. A. M., and Doppler's principle, 254 Mechanical slides, 140, 230 Melde's experiments, 267 Membranes vibration in, 268-272