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444 OPTICAL PROJECTION FER INV Ferguson, Prof., and chemical apparatus, 245 Figures, Lissajous', 255, 258 Films, thin, colours of, 324 ; soap, 225, 326; and electric currents, 408; crossed for polarising, 355, 382 Flames, manometric, 2G9; sensi- tive, 270 Flashing on effects, 122 Fluorescence, 317 Focus of a lens, 5; and size of image, 7, 30, 112; of lantern objectives, 113 Focussing lenses, loose for project- ing, 175 Forces, parallelogram of, 217 Forks, vibrations of, 253, 25S Formulas for lantern distances, discs, and foci, 112 Four-way tap, 121 Fox's mica preparations, 355 Frame, rotating, 348 Frames for portable screens, 131 Fresnel's bi-prism, 332 Fringes, interference, 332 Frog, circulation in, 205 Fronts, of lanterns, 32; optical, 171 Fuchsine, dispersion of, 295 GALVANOMETERS, and use, 400 Gas-bags, 42 ; cylinders, 82 Gas-burners, 40, 178, 418 Gas-supply, nozzles for, 47 Gases, phenomena of, 229 Gasoline for O.-H. light, 100 Gauze, diffraction by, 335 Gelatine for diagrams, 413 Generators for ether light, 92, 95 German model lantern, 153 Glass, compressed or heated, 360; sounded, 362 Glass polarising apparatus, 340, 345 Glasses for acoustics, 249 Gratings, diffraction, 334 Gravett's condenser, 18 Gravitation, 220 Ground-glass, drawings on, 413 Giilcher arc-lamp, 103 HALOS, projection of, 335 Hardwich, Eev. F., and ether light, 93 Harmonic vibrations, 252, 267 Hawkridge's vertical lantern, 168 Heart, movements of, 235 Heat. 385; identity with light, 392 ; in the microscope, 183 Hepworth, Mr., on stand for the lantern, 133 Herschel condenser, 18 Highley, Mr., on jets, 47, 67 Hopkins, G. M., electrical experi- ments, 399 Huygen's apparatus and experi- ment, 349 Hydrogen, preparation of, 73 Hydrostatics, 221 ICELAND spar, scarcity of, 345 Illuminating power of spirit jets, 47; oxy-gas jets, 50; mixed jets, 62 ; arc light, 164 Image-forming power of all light- rays, 2, 274 Image, microscopic, in demonstra- tion, 190 Images, not formed by lenses, 1; inversion of, 3, 6, 215 ; relative size of, 3 Immersion micro-objectives, 195 Incandescent lamp, 40, 41, 418; projection of, 409 ; spirit burner, 418 Inches of gas-pressure, 54 Inclination of nipple and lime in jets, 67 Induction, magnetic, 395 ; static, 396; current, 402 Institutions and screens, 124, 126 Interference of light, 321 ; of polarised light, 352; heat, 393 Inversion of images, 215 Invisible spectrum, the, 315