I.

Iceland spar, 399.

Illuminating power of gas, 774.

Illusion by movement of eye, 475. by persistence of vision, 476. stage, 290.

Images formed by lenses, 399, 616.

Impact theory of Stellar Evolution, 718.

Incandescent electric light, 528.

Incandescent gas-burners, 777.

INCLINED RAILWAYS, 125.

_Inconstant_, H.M.S., 152.

INDIA-RUBBER, 724.

INDIA-RUBBER AND GUTTA-PERCHA, 724.

Indicator, 9.

INDUCED CURRENTS, 502.

Induction coils, 503.

Injector, Giffard’s, 11.

Instantaneous photography, 623.

INTRODUCTION, 1.

IRON, 29.

IRON BRIDGES, 276.

IRON IN ARCHITECTURE, 72.

Iron, cast, 40. chemical changes of, 34. lighthouses, 596. meteoric, 32. ores, 39. pig, 40. ships, 133. smelting, 39. utility of, 30. wrought, 47.

Ismaïlia, 260.

J.

Jablochkoff’s electric candle, 525.

Jackson, 551.

Jacobi, 531.

Jamin’s magnet, 513.

Johannesburg, 694.

Joule, 804, 805.

Joy’s valve gear, 20.

Jupiter, 384.

K.

Kaleidoscope, 389.

Karoos, 705.

Kimberley, 705.

Kinetographic theatre, 479.

Kinetoscope, 478.

Kirchhoff, 422.

Klondyke, 692.

_König_ or _Kaiser Wilhelm_, ironclad, 164.

König’s printing machine, 308.

Krupp’s guns, 214. steel, 55. works, 56.